How Do Fireworks Work?

Originally published on July 4, 2012.

From holidays like the Fourth of July to victories, fireworks mean celebration. And to me, they’re a celebration of chemistry too. Atoms and reactions power the colors, sounds and smoke of fireworks.

The first firecracker was discovered in China about 1,000 years ago. Called black powder, this explosive is a mixture of potassium nitrate, charcoal and sulfur. You only need the first two ingredients, an oxidizing agent and a fuel, to start the explosion. The oxidizing agent, often a perchlorate or nitrate salt, releases oxygen gas that feeds the fire in a firework. The fuel reacts with the oxidizing agent to create the gas. The sulfur in black powder intensifies and continues the reaction between the other two ingredients. Learn more about the chemistry of fireworks from the American Chemical Society:


Pyrotechnicians often add metal salts to make colorful fireworks. Here’s where that color comes from: Heating atoms of sodium, barium or strontium pumps energy into the electrons whizzing around each nucleus. Those energized electrons shoot up to higher locations in the atom. As they fall back down to their usual positions, the electrons lose their extra energy as visible light.

The amount of energy released during this process – which depends on the element – is related to the color of the light that we see. Higher energy, like that released by copper atoms, corresponds to a shorter wavelength of light towards the blue end of the spectrum. Red light from strontium atoms has a longer wavelength and lower energy. (The same process gives neon lights their color too. Electricity energizes the neon, xenon or argon in the lights.)

Loud bangs come from confining the explosions in a shell, much like a grenade. Gases expand faster than the speed of sound when the shell bursts, creating a loud sonic boom.

An abandoned recipe for crackling fireworks called dragon eggs shows how chemists control the ingredients in the firework to get sound effects too. The oxidizing agent in this recipe is lead oxide, which becomes lead atoms as the firework burns. These atoms vaporize in the flame. And those vapors create off little crackles as they expand.

Whistling fireworks are more tricky. Pyrotechnicians need to find the right ingredients so that the mixture burns just enough to push air out of its tube — but doesn’t detonate with a bang.

The starburst patterns of fireworks depend on how the designers pack explosive pellets into a shell. For a look at the innards of a firework before it explodes, check out this diagram from NOVA Online.

In case you’re worried about the environmental effects of the perchlorate oxidizers or metal colorants, fear not. Chemists are developing recipes for environmentally-friendly fireworks too.

Enjoy the fireworks this holiday and stay safe! For those looking to host their own fireworks shows, check your local laws first. It’s illegal where I live.



from QUEST http://ift.tt/298xh7k

Originally published on July 4, 2012.

From holidays like the Fourth of July to victories, fireworks mean celebration. And to me, they’re a celebration of chemistry too. Atoms and reactions power the colors, sounds and smoke of fireworks.

The first firecracker was discovered in China about 1,000 years ago. Called black powder, this explosive is a mixture of potassium nitrate, charcoal and sulfur. You only need the first two ingredients, an oxidizing agent and a fuel, to start the explosion. The oxidizing agent, often a perchlorate or nitrate salt, releases oxygen gas that feeds the fire in a firework. The fuel reacts with the oxidizing agent to create the gas. The sulfur in black powder intensifies and continues the reaction between the other two ingredients. Learn more about the chemistry of fireworks from the American Chemical Society:


Pyrotechnicians often add metal salts to make colorful fireworks. Here’s where that color comes from: Heating atoms of sodium, barium or strontium pumps energy into the electrons whizzing around each nucleus. Those energized electrons shoot up to higher locations in the atom. As they fall back down to their usual positions, the electrons lose their extra energy as visible light.

The amount of energy released during this process – which depends on the element – is related to the color of the light that we see. Higher energy, like that released by copper atoms, corresponds to a shorter wavelength of light towards the blue end of the spectrum. Red light from strontium atoms has a longer wavelength and lower energy. (The same process gives neon lights their color too. Electricity energizes the neon, xenon or argon in the lights.)

Loud bangs come from confining the explosions in a shell, much like a grenade. Gases expand faster than the speed of sound when the shell bursts, creating a loud sonic boom.

An abandoned recipe for crackling fireworks called dragon eggs shows how chemists control the ingredients in the firework to get sound effects too. The oxidizing agent in this recipe is lead oxide, which becomes lead atoms as the firework burns. These atoms vaporize in the flame. And those vapors create off little crackles as they expand.

Whistling fireworks are more tricky. Pyrotechnicians need to find the right ingredients so that the mixture burns just enough to push air out of its tube — but doesn’t detonate with a bang.

The starburst patterns of fireworks depend on how the designers pack explosive pellets into a shell. For a look at the innards of a firework before it explodes, check out this diagram from NOVA Online.

In case you’re worried about the environmental effects of the perchlorate oxidizers or metal colorants, fear not. Chemists are developing recipes for environmentally-friendly fireworks too.

Enjoy the fireworks this holiday and stay safe! For those looking to host their own fireworks shows, check your local laws first. It’s illegal where I live.



from QUEST http://ift.tt/298xh7k

Are low wages an occupational health hazard? Two public health researchers say ‘yes’ [The Pump Handle]

Low wages certainly impact a person’s health, from where people live to what they eat to how often they can visit a doctor. And low and stagnant wages certainly contribute to poverty, which is a known risk factor for poor health and premature mortality. But should low wages be considered an occupational health hazard?

Health economist J. Paul Leigh thinks that they should. In an article published in May in the Journal of Occupational and Environmental Medicine (JOEM), Leigh, a professor of health economics at the University of California-Davis, and Roberto De Vogli, a global health professor at the university, put forth a compelling argument that our current understanding of occupational hazards should expand to include low wages. In particular, Leigh says such recognition would fall under the psychosocial aspects of work that can affect a person’s physical and mental well-being.

“Wages are intimately associated with work,” Leigh told me. “Above and beyond the fact that you can buy things you need with wages, it’s an identity marker for a job and for status in the community and in society. In our minds, it’s a natural extension of the burgeoning field of the psychosocial aspects of work. …If you want to talk about the psychosocial aspects of a job, I’d argue that wages are way up there, if not at the top.”

The study of the psychosocial aspects of work is a fairly new field compared to the study of more traditional occupational health and safety issues, such as preventing falls on a construction site or reducing harmful chemical exposures on an oil rig or safeguarding manufacturing workers against amputation risks. Psychosocial job risks, on the other hand, can include job stress and strain, interpersonal relationships at work, job insecurity, irregular scheduling practices, long work hours, unfair treatment in the workplace or outright discrimination.

Fortunately, many of these psychosocial issues are already the focus of health-related study. For example, research has found an association between job strain and long working hours and an elevated risk of heart disease and stroke; other research has found a link between high-demand jobs in which employees have little control over their tasks and negative mental health outcomes; and other studies have revealed links between particular scheduling practices, like shift work, and elevated risks of heart disease, depression and even cancer. In a 2008 report from the National Institute for Occupational Safety and Health (NIOSH), the authors wrote: “The economic costs of job strain and job stress in general are related to absenteeism, turnover and lost productivity, and, although difficult to estimate, could be as high as several hundred billion dollars per year.”

In arguing that low wages should be added to the list of psychosocial work hazards, Leigh and De Vogli write:

Just as psychologists and sociologists have attempted to widen occupational hazards to include psychosocial characteristics, this essay has cited economic and other social science research in an effort to include an economic variable: low wages. Wages are integral characteristics of jobs just as much as toxic physical, chemical, biological, or psychosocial exposures. Low wages are experienced by over 25 percent of the American workforce and that percentage has been increasing since 2001. Numerous hypotheses suggest that at least part of the correlations between wages and health can be attributed to low wages resulting in poor health or health behaviors rather than vice versa.

Leigh and De Vogli lay out their argument in three parts: hypotheses for the associations between wages and health; direct evidence regarding the impact of wages on health and health behavior; and the implications for policy and public health. But before diving in any further, we should probably make one thing clear — their argument focuses on wages, not income. Income, Leigh reminded me, can come from a variety of sources, such as Social Security, pensions, stock dividends, public assistance programs or rent from a tenant. Wages — while a subset of income — are directly linked to a person’s job.

In addition, Leigh said he wanted to focus on wages, as opposed to income, because there are very specific policy actions that can impact wages, such as state lawmakers voting to boost the minimum wage.

Among the hypotheses that Leigh and De Vogli offer in the JOEM article are ones that consider wages as contributors to low self-esteem; link wages to one’s ability and desire to invest in his or her health; and the more tangible deprivation that comes with low wages, such as a person’s ability to pay rent, see a doctor or live in a safe neighborhood. For example, the article cites a theory from Nobel Prize-winning economist Gary Becker, who argued that increasing wages may give more people a greater opportunity to be more future-oriented. And people who are more future-oriented may be more likely to invest in their health.

“Having a higher wage encourages your imagination to think about the future,” Leigh told me. “And if you’re thinking about the future, you may invest in being healthy five or 10 years from now. …It enables you to imagine the future more vividly.”

The paper also notes hypotheses on the other side of the argument, such as one that posits that being in poor health leads a person to earn low wages, instead of low wages leading to poor health. There’s also the hypothesis that any association between low wages and poor health is simply a coincidence. However, as none of the paper’s hypotheses automatically cancel each other out, Leigh and De Vogli write: “For our purposes, the most important question is whether there is evidence for increasing wages causing improvements in health and/or health behaviors regardless of the hypothesized mechanisms…”

In the “Evidence” portion of the paper, Leigh and De Vogli cite a number of studies, such as one that found low wages may be connected to a low risk of quitting smoking or that low wages may be a predictor of future hypertension. And in the article’s section on “Implications for Policy and Health,” the authors write that while there’s some debate about the impact of higher minimum wages on employment, there’s little question about the effect of a higher minimum wage on low-wage workers, adding that a hike in the federal minimum wage could benefit 35 million people.

“Viewing low wages as occupational hazards is consistent with opinions that living wage ordinances will enhance the population health of low-income communities,” Leigh and De Vogli argue.

At the end of the day, Leigh told me that while he’d like to see agencies such as NIOSH expand their understanding of psychosocial hazards to include low wages, he also hopes to elevate the connections between better wages and broader public health goals.

“I want people in public health to try to imagine or think about the minimum wage as a public health policy lever,” he said.

To request a full copy of “Low Wages as Occupational Health Hazards,” visit the Journal of Occupational and Environmental Medicine.

Kim Krisberg is a freelance public health writer living in Austin, Texas, and has been writing about public health for nearly 15 years.



from ScienceBlogs http://ift.tt/29jw9Ow

Low wages certainly impact a person’s health, from where people live to what they eat to how often they can visit a doctor. And low and stagnant wages certainly contribute to poverty, which is a known risk factor for poor health and premature mortality. But should low wages be considered an occupational health hazard?

Health economist J. Paul Leigh thinks that they should. In an article published in May in the Journal of Occupational and Environmental Medicine (JOEM), Leigh, a professor of health economics at the University of California-Davis, and Roberto De Vogli, a global health professor at the university, put forth a compelling argument that our current understanding of occupational hazards should expand to include low wages. In particular, Leigh says such recognition would fall under the psychosocial aspects of work that can affect a person’s physical and mental well-being.

“Wages are intimately associated with work,” Leigh told me. “Above and beyond the fact that you can buy things you need with wages, it’s an identity marker for a job and for status in the community and in society. In our minds, it’s a natural extension of the burgeoning field of the psychosocial aspects of work. …If you want to talk about the psychosocial aspects of a job, I’d argue that wages are way up there, if not at the top.”

The study of the psychosocial aspects of work is a fairly new field compared to the study of more traditional occupational health and safety issues, such as preventing falls on a construction site or reducing harmful chemical exposures on an oil rig or safeguarding manufacturing workers against amputation risks. Psychosocial job risks, on the other hand, can include job stress and strain, interpersonal relationships at work, job insecurity, irregular scheduling practices, long work hours, unfair treatment in the workplace or outright discrimination.

Fortunately, many of these psychosocial issues are already the focus of health-related study. For example, research has found an association between job strain and long working hours and an elevated risk of heart disease and stroke; other research has found a link between high-demand jobs in which employees have little control over their tasks and negative mental health outcomes; and other studies have revealed links between particular scheduling practices, like shift work, and elevated risks of heart disease, depression and even cancer. In a 2008 report from the National Institute for Occupational Safety and Health (NIOSH), the authors wrote: “The economic costs of job strain and job stress in general are related to absenteeism, turnover and lost productivity, and, although difficult to estimate, could be as high as several hundred billion dollars per year.”

In arguing that low wages should be added to the list of psychosocial work hazards, Leigh and De Vogli write:

Just as psychologists and sociologists have attempted to widen occupational hazards to include psychosocial characteristics, this essay has cited economic and other social science research in an effort to include an economic variable: low wages. Wages are integral characteristics of jobs just as much as toxic physical, chemical, biological, or psychosocial exposures. Low wages are experienced by over 25 percent of the American workforce and that percentage has been increasing since 2001. Numerous hypotheses suggest that at least part of the correlations between wages and health can be attributed to low wages resulting in poor health or health behaviors rather than vice versa.

Leigh and De Vogli lay out their argument in three parts: hypotheses for the associations between wages and health; direct evidence regarding the impact of wages on health and health behavior; and the implications for policy and public health. But before diving in any further, we should probably make one thing clear — their argument focuses on wages, not income. Income, Leigh reminded me, can come from a variety of sources, such as Social Security, pensions, stock dividends, public assistance programs or rent from a tenant. Wages — while a subset of income — are directly linked to a person’s job.

In addition, Leigh said he wanted to focus on wages, as opposed to income, because there are very specific policy actions that can impact wages, such as state lawmakers voting to boost the minimum wage.

Among the hypotheses that Leigh and De Vogli offer in the JOEM article are ones that consider wages as contributors to low self-esteem; link wages to one’s ability and desire to invest in his or her health; and the more tangible deprivation that comes with low wages, such as a person’s ability to pay rent, see a doctor or live in a safe neighborhood. For example, the article cites a theory from Nobel Prize-winning economist Gary Becker, who argued that increasing wages may give more people a greater opportunity to be more future-oriented. And people who are more future-oriented may be more likely to invest in their health.

“Having a higher wage encourages your imagination to think about the future,” Leigh told me. “And if you’re thinking about the future, you may invest in being healthy five or 10 years from now. …It enables you to imagine the future more vividly.”

The paper also notes hypotheses on the other side of the argument, such as one that posits that being in poor health leads a person to earn low wages, instead of low wages leading to poor health. There’s also the hypothesis that any association between low wages and poor health is simply a coincidence. However, as none of the paper’s hypotheses automatically cancel each other out, Leigh and De Vogli write: “For our purposes, the most important question is whether there is evidence for increasing wages causing improvements in health and/or health behaviors regardless of the hypothesized mechanisms…”

In the “Evidence” portion of the paper, Leigh and De Vogli cite a number of studies, such as one that found low wages may be connected to a low risk of quitting smoking or that low wages may be a predictor of future hypertension. And in the article’s section on “Implications for Policy and Health,” the authors write that while there’s some debate about the impact of higher minimum wages on employment, there’s little question about the effect of a higher minimum wage on low-wage workers, adding that a hike in the federal minimum wage could benefit 35 million people.

“Viewing low wages as occupational hazards is consistent with opinions that living wage ordinances will enhance the population health of low-income communities,” Leigh and De Vogli argue.

At the end of the day, Leigh told me that while he’d like to see agencies such as NIOSH expand their understanding of psychosocial hazards to include low wages, he also hopes to elevate the connections between better wages and broader public health goals.

“I want people in public health to try to imagine or think about the minimum wage as a public health policy lever,” he said.

To request a full copy of “Low Wages as Occupational Health Hazards,” visit the Journal of Occupational and Environmental Medicine.

Kim Krisberg is a freelance public health writer living in Austin, Texas, and has been writing about public health for nearly 15 years.



from ScienceBlogs http://ift.tt/29jw9Ow

Giving Back to Girl Scouts: Water Drop Patch Inspires Young Stewardship

By Michele Drennan

Some of the happiest times I experienced during my childhood in St. Joseph, Mo., were spent as a Girl Scout in St. Francis Xavier Troop #1385. As I look back, memories of going to campouts and field trips, making crafts, earning merit badges and patches, and volunteering to help others provided a positive influence in my life.

EPA team members Jessica Hing, Michele Drennen, and Margarete Heber

EPA team members Jessica Hing, Michele Drennen, and Margarete Heber

When I saw a posting on the One EPA Skills Marketplace website seeking employees who could assist the Girl Scouts organization, I jumped on it!

The Skills Marketplace is a voluntary program that expands professional development opportunities by allowing EPA employees, with supervisor permission, to spend up to 20 percent of their time working on a project in any part of the agency, without leaving their home office.

Before leaving work late one evening in July 2015, I checked the Skills Marketplace website to see if there were any projects related to the field of graphic design. I was excited to see a position for individuals to work with EPA’s Office of Water and the Smithsonian. The Smithsonian wanted to offer a “Waterway” link on their website, which would include free lesson plans for K-12 teachers on water topics, and they recruited EPA as a partner in this endeavor.

The Waterway program is a six-year education and awareness initiative to promote and encourage good stewardship of water. For the program to be successful, it is essential to connect with the public and educate them on the importance of protecting our waterways.

Water Drop Patch with five “rockers”

Water Drop Patch with five “rockers”

The anticipated outcome of this Skills Marketplace project was a completed revision and posting of an updated Girl Scouts Water Drop Patch on the Girl Scouts Council of the Nation’s Capital (GSCNC) website, along with requirement guides to engage Girl Scouts in grades K-12.

I applied for the position right away because I knew I could make a tremendous contribution to this project. In addition, I wanted to learn more about the Waterway program and reconnect with the Girl Scouts program that I had remembered so fondly as a child.

I was contacted the next morning by EPA’s Water Data Project Lead, Margarete Heber. After a phone interview, Margarete said she wanted to partner with another EPA applicant, Jessica Hing, whose outreach experience would combine perfectly with my graphic art background to work on the GSCNC Water Drop Patch. Margarete also added a NASA Communication Specialist, Dorian Janney, to the Skills Marketplace team. Dorian brought a vast amount of children’s education outreach experience.

Over the next several months, our team assembled content for requirement guides for each of the Girl Scout levels, containing hands-on projects that were age-appropriate for each level. Once we determined the content for each guide, I designed a draft guide for the GSCNC to approve.

Hands-on learning about Water Drop Patch at Girl Scouts 2016 Maker Day

Hands-on learning about Water Drop Patch at Girl Scouts 2016 Maker Day

I also had the privilege of designing the Water Drop Patch along with five “rocker” patches that fit under the main patch, which could be earned at each Girl Scout level. The rocker patches encourage Girl Scouts to continue to expand their knowledge of their water environment at each program level. Daisies learn about the water cycle; Brownies learn about groundwater; Juniors learn about watersheds; Cadettes learn about careers in the field of water; and Seniors/Ambassadors learn about water laws and water ethics.

On May 7, 2016, I flew to Washington, D.C., to join Margarete and Jessica at the rollout of the Water Drop Patch at Girl Scouts 2016 Maker Day. This event promotes hands-on learning across all levels and provides a place to explain, demonstrate, and share their projects with each other. The One EPA Skills Marketplace team, joined by two Senior Girl Scouts, generated enthusiasm and interest in the Water Drop Patch among the Girl Scouts and their leaders by offering demonstrations of the requirements for each level.

Water Drop Patch information, along with other patches Girl Scouts can earn, is available on the National Girl Scouts website.

About the Author: Michele Drennen serves as an Environmental Protection Specialist at EPA Region 7. She is also on the Process Excellence Team and serves as Skills Marketplace Coordinator for EPA Region 7. Michele has a degree in english with an emphasis in technical communication and a minor in business from Missouri Western State University.



from The EPA Blog http://ift.tt/295TQYr

By Michele Drennan

Some of the happiest times I experienced during my childhood in St. Joseph, Mo., were spent as a Girl Scout in St. Francis Xavier Troop #1385. As I look back, memories of going to campouts and field trips, making crafts, earning merit badges and patches, and volunteering to help others provided a positive influence in my life.

EPA team members Jessica Hing, Michele Drennen, and Margarete Heber

EPA team members Jessica Hing, Michele Drennen, and Margarete Heber

When I saw a posting on the One EPA Skills Marketplace website seeking employees who could assist the Girl Scouts organization, I jumped on it!

The Skills Marketplace is a voluntary program that expands professional development opportunities by allowing EPA employees, with supervisor permission, to spend up to 20 percent of their time working on a project in any part of the agency, without leaving their home office.

Before leaving work late one evening in July 2015, I checked the Skills Marketplace website to see if there were any projects related to the field of graphic design. I was excited to see a position for individuals to work with EPA’s Office of Water and the Smithsonian. The Smithsonian wanted to offer a “Waterway” link on their website, which would include free lesson plans for K-12 teachers on water topics, and they recruited EPA as a partner in this endeavor.

The Waterway program is a six-year education and awareness initiative to promote and encourage good stewardship of water. For the program to be successful, it is essential to connect with the public and educate them on the importance of protecting our waterways.

Water Drop Patch with five “rockers”

Water Drop Patch with five “rockers”

The anticipated outcome of this Skills Marketplace project was a completed revision and posting of an updated Girl Scouts Water Drop Patch on the Girl Scouts Council of the Nation’s Capital (GSCNC) website, along with requirement guides to engage Girl Scouts in grades K-12.

I applied for the position right away because I knew I could make a tremendous contribution to this project. In addition, I wanted to learn more about the Waterway program and reconnect with the Girl Scouts program that I had remembered so fondly as a child.

I was contacted the next morning by EPA’s Water Data Project Lead, Margarete Heber. After a phone interview, Margarete said she wanted to partner with another EPA applicant, Jessica Hing, whose outreach experience would combine perfectly with my graphic art background to work on the GSCNC Water Drop Patch. Margarete also added a NASA Communication Specialist, Dorian Janney, to the Skills Marketplace team. Dorian brought a vast amount of children’s education outreach experience.

Over the next several months, our team assembled content for requirement guides for each of the Girl Scout levels, containing hands-on projects that were age-appropriate for each level. Once we determined the content for each guide, I designed a draft guide for the GSCNC to approve.

Hands-on learning about Water Drop Patch at Girl Scouts 2016 Maker Day

Hands-on learning about Water Drop Patch at Girl Scouts 2016 Maker Day

I also had the privilege of designing the Water Drop Patch along with five “rocker” patches that fit under the main patch, which could be earned at each Girl Scout level. The rocker patches encourage Girl Scouts to continue to expand their knowledge of their water environment at each program level. Daisies learn about the water cycle; Brownies learn about groundwater; Juniors learn about watersheds; Cadettes learn about careers in the field of water; and Seniors/Ambassadors learn about water laws and water ethics.

On May 7, 2016, I flew to Washington, D.C., to join Margarete and Jessica at the rollout of the Water Drop Patch at Girl Scouts 2016 Maker Day. This event promotes hands-on learning across all levels and provides a place to explain, demonstrate, and share their projects with each other. The One EPA Skills Marketplace team, joined by two Senior Girl Scouts, generated enthusiasm and interest in the Water Drop Patch among the Girl Scouts and their leaders by offering demonstrations of the requirements for each level.

Water Drop Patch information, along with other patches Girl Scouts can earn, is available on the National Girl Scouts website.

About the Author: Michele Drennen serves as an Environmental Protection Specialist at EPA Region 7. She is also on the Process Excellence Team and serves as Skills Marketplace Coordinator for EPA Region 7. Michele has a degree in english with an emphasis in technical communication and a minor in business from Missouri Western State University.



from The EPA Blog http://ift.tt/295TQYr

Boris Johnson is a tosser [Stoat]

I haven’t had a tosser for a while, the last was Quentin Letts, so it seems appropriate that this year’s winner should be another joke Tory pol, Boris the Clown. For whom Satirists can’t f*cking type quick enough seems to have been written.

Having joined “Leave” purely for his own stupid selfish political gain, the bozo has taken fright at what’s happened and ducked out of the Tory leadership race like the pathetic low-grade coward he is. I suppose he was a useful idiot to head the Leave campaign… but, really, what was the point?

He wasn’t in “Leave” from conviction, he was in it for his own ends, which could only have been the PM job. Which he’s now wimped out of. Much in the same way that many Leave supporters would now like to wimp out of actually leaving. Unlike them, he can change his mind.



from ScienceBlogs http://ift.tt/299E93R

I haven’t had a tosser for a while, the last was Quentin Letts, so it seems appropriate that this year’s winner should be another joke Tory pol, Boris the Clown. For whom Satirists can’t f*cking type quick enough seems to have been written.

Having joined “Leave” purely for his own stupid selfish political gain, the bozo has taken fright at what’s happened and ducked out of the Tory leadership race like the pathetic low-grade coward he is. I suppose he was a useful idiot to head the Leave campaign… but, really, what was the point?

He wasn’t in “Leave” from conviction, he was in it for his own ends, which could only have been the PM job. Which he’s now wimped out of. Much in the same way that many Leave supporters would now like to wimp out of actually leaving. Unlike them, he can change his mind.



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Discovery exposes fragility of Antarctica’s Larsen C ice shelf

This is a re-post from Carbon Brief by Roz Pidcock

Scientists have unearthed a 100m-thick river of ice beneath Antarctica’s Larsen C ice shelf, which they fear could accelerate its path to eventual collapse.

A team led by Prof Bryn Hubbarddirector of the centre for glaciology at Aberystwyth University in Wales, lived on the ice shelf for several months examining what it looks like from the inside.

Their new paper describes how the layer of solid ice could be speeding up the flow of ice to the ocean, potentially leading Larsen C towards a similar fate to its now-collapsed sister ice shelves, Larsen A and B.

In January, Hubbard was awarded the prestigious Polar Medalin recognition of his services to polar science. He joins an illustrious list of explorers and pioneers, with Captain Robert F Scott, Sir Ernest Shackleton, Sir Edmund Hillary and Sir Ranulph Fiennes among its former recipients.

Carbon Brief has been speaking to Hubbard about his new research, the future of Antarctica and his reflections from a life spent on the ice.

‘Catastrophic breakup’

For more than 25 years, Hubbard has been studying the world’s icy expanses, venturing out each year to live and work on the ice for months at a time. He tells Carbon Brief:

“I am extremely fortunate to be able to recount research field trips to Greenland, Svalbard, Arctic Canada, as well as Antarctica (while most of my early research was actually undertaken in the Swiss and French Alps).”

Hubbard’s latest study has taken him to Larsen C ice shelf in Antarctica, a floating mass of ice protruding from the Antarctica Peninsula in the northern part of the continent.

Several major ice shelves have collapsed almost completely, losing the vast majority of their mass in just a few months. The most widely reported of these “catastrophic breakup events” were the Larsen A and B ice shelves, which collapsed in 1995 and 2002, respectively.

Larsen C is the next ice shelf in line, geographically-speaking. It is also the largest of the three sister shelves, with a surface area two and a half times the size of Wales.

Gif showing the disintegration of Larsen B ice shelf

Credits | Images: NASA Earth Observatory. Gif: Rosamund Pearce for Carbon Brief.

Meltponds

The Antarctic Peninsula is one of the fastest warming places on Earth. Temperatures have risen by 2.5C in the past 50 years. Warmer air is causing the surface of the ice to melt, forming pools of water known as “meltponds”.

Meltponds tend to form in a line “like a string of sausages” and are thought to have contributed to the collapse of ice shelves in the past, including Larsen B. Hubbard tells Carbon Brief:

“We started the work on Larsen C Ice Shelf for the simple reason that satellite images and a small number of aircraft flyovers indicated that melt ponds were forming on their surface regularly.”

Until now, scientists had suspected that meltponds exerted stress through the sheer weight of the water pushing down on the ice below it. But Hubbard and his team wondered if there was a different explanation. He tells Carbon Brief:

“The rationale for our project was to investigate whether the ponds had an influence on the internal structure of the underlying ice shelf.”

Drill deep

With the logistical support of the British Antarctic Survey, Hubbard and his team camped on the ice in traditional ‘Scott’ tents for several months in the summer of 2014/15.

The team drilled a 100m-long borehole in a part of the Larsen-C ice shelf called Cabinet Inlet, where scientists first spotted meltponds 15 years ago.

Just a few metres below the surface, they struck upon a layer of solid ice about 100 metres thick, formed as water from the meltponds percolates through the ice and refreezes.

The discovery was startling, says Hubbard, not only because of the ice layer’s thickness but because of its proximity to the surface. He tells Carbon Brief:

“Upon drilling our borehole in Cabinet Inlet, we were pretty amazed that the drill struck something solid at a depth of only 3m below the surface…To my knowledge, this is the first time that anybody has encountered massive ice of this nature.”

At these shallow depths in other ice sheets, such as Greenland and East Antarctica, scientists have found compacted snow, stacking up in layers as more snow falls on top. Solid ice is usually found much deeper, more like 50-70m below the surface, Hubbard explains.

Schematic showing the discovery of a massive ice layer beneath the surface at Cabinet Inlet on the Larsen-C ice shelf

The discovery of a massive ice layer beneath the surface at Cabinet Inlet on the Larsen-C ice shelf, Antarctic Peninsula. Source: Hubbard et al., (2016).

Cause for concern

The vast icy layer below Larsen C is a concern, says Hubbard. It is warmer than the compacted snow it replaced because of the latent heat that is released as the percolating meltwater refreezes at depth. Thi, in turn affects how the ice moves, Hubbard explains:

“Similar to syrup, warm ice flows more readily than cold ice.”

Hubbard and his team installed a string of instruments to take measurements within the icy layer, returning to collect the data a year later. They found temperatures of between -5C and -10C, a full 10C above what they expected for this depth range. Hubbard says:

“This suggests that not only is the massive ice layer denser than that which would be present in the absence of surface ponds, but that it is also substantially warmer, both having implications for the movement and stability of the ice shelf.”

Using ground-penetrating radar and satellite instruments, the scientists estimated that the icy layer was 16 km wide and several kilometers long. While icy layers have been found elsewhere in Antarctica, the Larsen-C discovery is exceptionally large. Hubbard tells Carbon Brief:

“In east Antarctica, working with the Belgians out of their (carbon neutral) Princess Elisabeth research station, we also found internal ice layers – but at the less extreme end of the scale.”

Nevertheless, it will be sometime before the consequences for Larsen-C are fully understood, Hubbard adds:

“We cannot really determine the implications yet without running all of the information for the entire ice shelf in a computer model, and unfortunately we do not have all of that information yet.”

Other recent research points to a thinning of Larsen C by four metres from 1998-2012, putting it at greater risk of collapse. Ice shelves can also melt from underneath as the ocean warms.

Hubbard suspects vast icy layers could be discovered in many of Antarctica’s other ice shelves in the coming decades. He says:

“[The changes we report] can in all likelihood be anticipated at an increasing number of Antarctica’s fringing ice shelves – and perhaps all of them – over the next century or so as surface warming continues.”

Since ice shelves float on the water, when an ice shelf collapses entirely it doesn’t directly affect sea levels. But once an ice shelf disappears, there’s little to stop the glaciers behind it from flowing into the ocean, causing sea level to rise faster.

A life less ordinary

Hubbard’s research has led him to some of the world’s most inhospitable landscapes. Part of the reason the ice layer below the surface of Larsen C hasn’t been discovered until now, he says, is because of the logistics of carrying out this kind of research in such a challenging place.

But Hubbard looks back fondly his quarter-century of polar expeditions, telling Carbon Brief:

“Each and every one of these trips has been interesting for various reasons; always challenging, always amazing, often fruitful, and occasionally somewhat disastrous.”

Hubbard’s services to science were honoured earlier this year, collecting the distinguished Polar Medal for his outstanding contribution to science under conditions of extreme hardship.

At the time, Prof April McMahon, vice-chancellor of Aberystwyth University called the award “a just recognition of a life dedicated to the discipline.” She added:

“Professor Hubbard and his colleagues at the Centre for Glaciology are at the cutting edge of understanding the effects of climate change on some of the Earth’s most extreme and inhospitable places, and of developing the scientific models that will help us understand better how our planet is likely to respond to an increasingly warm environment”.

Despite the challenges, Hubbard says always seems to go back for more. Though what keeps drawing him back is a mystery, he says:

“To tell the complete truth I don’t even like the cold.”


from Skeptical Science http://ift.tt/299zizJ

This is a re-post from Carbon Brief by Roz Pidcock

Scientists have unearthed a 100m-thick river of ice beneath Antarctica’s Larsen C ice shelf, which they fear could accelerate its path to eventual collapse.

A team led by Prof Bryn Hubbarddirector of the centre for glaciology at Aberystwyth University in Wales, lived on the ice shelf for several months examining what it looks like from the inside.

Their new paper describes how the layer of solid ice could be speeding up the flow of ice to the ocean, potentially leading Larsen C towards a similar fate to its now-collapsed sister ice shelves, Larsen A and B.

In January, Hubbard was awarded the prestigious Polar Medalin recognition of his services to polar science. He joins an illustrious list of explorers and pioneers, with Captain Robert F Scott, Sir Ernest Shackleton, Sir Edmund Hillary and Sir Ranulph Fiennes among its former recipients.

Carbon Brief has been speaking to Hubbard about his new research, the future of Antarctica and his reflections from a life spent on the ice.

‘Catastrophic breakup’

For more than 25 years, Hubbard has been studying the world’s icy expanses, venturing out each year to live and work on the ice for months at a time. He tells Carbon Brief:

“I am extremely fortunate to be able to recount research field trips to Greenland, Svalbard, Arctic Canada, as well as Antarctica (while most of my early research was actually undertaken in the Swiss and French Alps).”

Hubbard’s latest study has taken him to Larsen C ice shelf in Antarctica, a floating mass of ice protruding from the Antarctica Peninsula in the northern part of the continent.

Several major ice shelves have collapsed almost completely, losing the vast majority of their mass in just a few months. The most widely reported of these “catastrophic breakup events” were the Larsen A and B ice shelves, which collapsed in 1995 and 2002, respectively.

Larsen C is the next ice shelf in line, geographically-speaking. It is also the largest of the three sister shelves, with a surface area two and a half times the size of Wales.

Gif showing the disintegration of Larsen B ice shelf

Credits | Images: NASA Earth Observatory. Gif: Rosamund Pearce for Carbon Brief.

Meltponds

The Antarctic Peninsula is one of the fastest warming places on Earth. Temperatures have risen by 2.5C in the past 50 years. Warmer air is causing the surface of the ice to melt, forming pools of water known as “meltponds”.

Meltponds tend to form in a line “like a string of sausages” and are thought to have contributed to the collapse of ice shelves in the past, including Larsen B. Hubbard tells Carbon Brief:

“We started the work on Larsen C Ice Shelf for the simple reason that satellite images and a small number of aircraft flyovers indicated that melt ponds were forming on their surface regularly.”

Until now, scientists had suspected that meltponds exerted stress through the sheer weight of the water pushing down on the ice below it. But Hubbard and his team wondered if there was a different explanation. He tells Carbon Brief:

“The rationale for our project was to investigate whether the ponds had an influence on the internal structure of the underlying ice shelf.”

Drill deep

With the logistical support of the British Antarctic Survey, Hubbard and his team camped on the ice in traditional ‘Scott’ tents for several months in the summer of 2014/15.

The team drilled a 100m-long borehole in a part of the Larsen-C ice shelf called Cabinet Inlet, where scientists first spotted meltponds 15 years ago.

Just a few metres below the surface, they struck upon a layer of solid ice about 100 metres thick, formed as water from the meltponds percolates through the ice and refreezes.

The discovery was startling, says Hubbard, not only because of the ice layer’s thickness but because of its proximity to the surface. He tells Carbon Brief:

“Upon drilling our borehole in Cabinet Inlet, we were pretty amazed that the drill struck something solid at a depth of only 3m below the surface…To my knowledge, this is the first time that anybody has encountered massive ice of this nature.”

At these shallow depths in other ice sheets, such as Greenland and East Antarctica, scientists have found compacted snow, stacking up in layers as more snow falls on top. Solid ice is usually found much deeper, more like 50-70m below the surface, Hubbard explains.

Schematic showing the discovery of a massive ice layer beneath the surface at Cabinet Inlet on the Larsen-C ice shelf

The discovery of a massive ice layer beneath the surface at Cabinet Inlet on the Larsen-C ice shelf, Antarctic Peninsula. Source: Hubbard et al., (2016).

Cause for concern

The vast icy layer below Larsen C is a concern, says Hubbard. It is warmer than the compacted snow it replaced because of the latent heat that is released as the percolating meltwater refreezes at depth. Thi, in turn affects how the ice moves, Hubbard explains:

“Similar to syrup, warm ice flows more readily than cold ice.”

Hubbard and his team installed a string of instruments to take measurements within the icy layer, returning to collect the data a year later. They found temperatures of between -5C and -10C, a full 10C above what they expected for this depth range. Hubbard says:

“This suggests that not only is the massive ice layer denser than that which would be present in the absence of surface ponds, but that it is also substantially warmer, both having implications for the movement and stability of the ice shelf.”

Using ground-penetrating radar and satellite instruments, the scientists estimated that the icy layer was 16 km wide and several kilometers long. While icy layers have been found elsewhere in Antarctica, the Larsen-C discovery is exceptionally large. Hubbard tells Carbon Brief:

“In east Antarctica, working with the Belgians out of their (carbon neutral) Princess Elisabeth research station, we also found internal ice layers – but at the less extreme end of the scale.”

Nevertheless, it will be sometime before the consequences for Larsen-C are fully understood, Hubbard adds:

“We cannot really determine the implications yet without running all of the information for the entire ice shelf in a computer model, and unfortunately we do not have all of that information yet.”

Other recent research points to a thinning of Larsen C by four metres from 1998-2012, putting it at greater risk of collapse. Ice shelves can also melt from underneath as the ocean warms.

Hubbard suspects vast icy layers could be discovered in many of Antarctica’s other ice shelves in the coming decades. He says:

“[The changes we report] can in all likelihood be anticipated at an increasing number of Antarctica’s fringing ice shelves – and perhaps all of them – over the next century or so as surface warming continues.”

Since ice shelves float on the water, when an ice shelf collapses entirely it doesn’t directly affect sea levels. But once an ice shelf disappears, there’s little to stop the glaciers behind it from flowing into the ocean, causing sea level to rise faster.

A life less ordinary

Hubbard’s research has led him to some of the world’s most inhospitable landscapes. Part of the reason the ice layer below the surface of Larsen C hasn’t been discovered until now, he says, is because of the logistics of carrying out this kind of research in such a challenging place.

But Hubbard looks back fondly his quarter-century of polar expeditions, telling Carbon Brief:

“Each and every one of these trips has been interesting for various reasons; always challenging, always amazing, often fruitful, and occasionally somewhat disastrous.”

Hubbard’s services to science were honoured earlier this year, collecting the distinguished Polar Medal for his outstanding contribution to science under conditions of extreme hardship.

At the time, Prof April McMahon, vice-chancellor of Aberystwyth University called the award “a just recognition of a life dedicated to the discipline.” She added:

“Professor Hubbard and his colleagues at the Centre for Glaciology are at the cutting edge of understanding the effects of climate change on some of the Earth’s most extreme and inhospitable places, and of developing the scientific models that will help us understand better how our planet is likely to respond to an increasingly warm environment”.

Despite the challenges, Hubbard says always seems to go back for more. Though what keeps drawing him back is a mystery, he says:

“To tell the complete truth I don’t even like the cold.”


from Skeptical Science http://ift.tt/299zizJ

After 6 years of working on climate at Harvard, I implore it to show the courage to divest

One morning in the summer of 2014, I found myself in the city of Tacloban in the Philippines. The city and surrounding area had been devastated less than a year earlier by Super Typhoon Yolanda. Thousands had been killed; bodies were found for months afterwards. 

As part of an international research collaboration, I was interviewing government officials and others throughout the Philippines to assess how to improve preparedness for and response to climate-related disasters. I had already interviewed survivors in cities and villages across the country about the impacts of extreme weather. (And, incidentally, a few weeks later, I would contract dengue and chikungunya—two mosquito-borne diseases aided by climate changein their ongoing spread.) With my prior experience, I thought I was prepared for what I would hear that morning, but I wasn’t.

As I prepared for the day’s interviews, I spoke with a man of about fifty who was helping us to navigate. He described the impact of the storm, the thousands of bodies lying about, his attempts to somehow help despite the overwhelming magnitude of the destruction and death. His own son had gone missing, but there was no time to search; the need for attention to those around him was too immediate and great. The destruction’s scale made the attempted cleanup a kind of futile, obligatory madness—but one that seemed necessary by the standards of human decency. 

The madness, the decency, the inhuman work of cleaning a mountain of death and sadness continued for weeks, until someone informed him that they had found his son. He was miles away, his body in a mangrove patch, decomposing. The father collected his son’s remains, like so many others did, and then returned to the never-ending work. There was too much to do.

And as the father spoke to me, some half a year later, there was still too much to do. The coastline had been reoccupied with shanties. Another typhoon season was coming. The father looked at me, and I could see his eyes. I cannot forget what I saw: trauma, grief, fear…all unprocessed, all repressed and pushed aside for months because there was no time to grieve, no time to come to peace, because there was too much to do; too much to do just to survive, just to live.

A theatre of the absurd

The next spring, I was in Massachusetts, on Harvard’s campus. People were awakening to the dangers of climate change. Massive demonstrations were occurring on campus to protest Harvard’s considerable investments in the fossil fuel sector (which constituted one-third of Harvard’s disclosed investments at the end of 2014). Student and alumni protestors had set up camp around the central administrative building. To avoid the protestors, the administration had moved operations to Loeb House, a small mansion on campus, which was surrounded by barricades and police to prevent protestors from approaching.

The former Harvard professor Cornel West whipped up the crowd with a characteristically fiery speech and led a march to Loeb House to deliver a letter to the administration. Hundreds, including myself, participated. As we approached, I could see administrative staff peering out at us past the velvet curtains.

When we got to the barricades, the police informed us that no one was in the building. Despite the human-looking figures inside poking their heads above the corners of windows to sneak a peak at the rabble outside, the police insisted the building was empty. I remember feeling confused—to be lied to blatantly is more disorienting than to be lied to subtly—and the crowd began to chant, calling for someone to come outside.

As hundreds stayed and chanted for ten, then twenty minutes—calling to the individuals they could see through the windows—individuals who were looking right back while the police insisted that no one was inside—I thought of the father in the Philippines. He did not choose to be surrounded by death; he did not choose to be tasked with the retrieval of his own son’s remains. He was not afforded even the basic privilege of time and space to grieve. He was afforded no choice but to repress his trauma and continue. And I thought of his son, who did not choose death. And yet in that moment I saw those who did have the luxury of choice, those who live lives of comfort, looking down from the windows of a mansion at a crowd whose request was to deliver a letter for the sake of human decency.

And yet, for the people in that house, to come outside to accept such a letter was below them—while hiding from their own students, and lying boldly to them, was not.

Finally—after it was clear that the protestors would not be leaving—someone did emerge from the empty house, accepting the contentious piece of paper and taking it inside. The protestors wanted Harvard to stand up to powerful interests by moving away from its fossil fuel stakes, yet its management was unwilling to accept a simple piece of paper—an arguably much easier task—without a theatre of the absurd.

It was in that moment that I realized that if our children look back to how we failed them, it will not have been for lack of scientific understanding or even technological prowess; it will have been due, fundamentally, to cowardice. A profound cowardice among those who actually do have a choice in this matter, a cowardice that confuses arrogance with intelligence, pettiness with importance, and, most fatally, comfort with necessity. 

Divestment’s controversy

Essentially all of the climate change controversy at Harvard has revolved around divestment. The idea of reducing investments in fossil fuels as a matter of policy began as an audacious suggestion designed to shock people into seeing the contradiction between our words and our actions on climate. After institutions began adopting the idea, it became a method to call attention to theobstructionism and denial propagated by fossil fuel companies. Institutions that were afraid of making enemies in industry—like Harvard and MIT—were, rather predictably, reluctant to take a public stand. But since the Paris climate agreement in 2015, the idea of divestment has evolved into something much more fundamental and unignorable.

In polite society—at least the kind that self-identifies with science—the Paris agreement is applauded, in essence, universally. Yet the implications of the agreement for investments are beginning to be reckoned with, and they are stark: by the IPCC’s most recent estimate, $100 billion per year needs to be disinvested from the fossil fuel extraction industry for the next twenty years. And when it comes to infrastructure, a recent study has found that no new fossil-fuel-using power plants can be built after next year (unless they are decommissioned prematurely—making them a bad investment). In other words, if we are serious about the Paris agreement, then there needs to be a deliberate shift of investments out of fossil fuels and into clean replacements at this moment. This is, technically speaking, the definition of divestment.

The catch, though, is that this is something that Harvard’s administration has vowed never to do. To analyze why is an exercise in theorizing—it may be due to the logic of economic Darwinism that underlies Harvard’s culture and wealth, a psychology of indignant authoritarianism among Harvard’s governing board, pervasive conflicts of interest (Harvard trustee Ted Wells is currently legal counsel for Exxon Mobil, for example), or nothing more than simple bureaucratic group-think—but regardless of the reason, the fact that the richest private university in the world openly defies the Paris agreement with its investment policies—while praising the agreement with words—is troubling. 

And this brings us to an uncomfortable but unavoidable question: does Harvard actually wantto fix climate change, or does it merely want to look like it wants to fix it? And perhaps more troublingly: do we actually want to fix climate change, or are we just going through the motions to save face, to avoid admitting to ourselves that, deep down, we aren’t who we thought we were, that we actually don’t care that much what happens to our children—or what happens to the world?

Fake it ‘til you make it

What does it look like to pretend to care? Harvard has announced that “green is the new crimson” and, to much fanfare, spends a special $1 million per year on climate research. But in the face of a civilizational crisis—and for an institution whose research spending is on the order of a billion dollars per year already—what is the intended purpose of this much-publicized $1 million? Harvard spends the same to pay its president (more than the president of the US)—and fifty times more just to pay half a dozen of its money managers. Meanwhile, Harvard likely has hundreds of millions—or more—invested in fossil fuels. If we look past the fanfare and see the world’s richest private university spending $1 million per year to address a civilizational crisis, congratulating itself while investing hundreds of times more in the root cause of that crisis, are we supposed to feel reassured? Or can this only be interpreted as the most illuminating kind of satire of all—that is, the kind that is real?

It might be suggested that universities are places of discourse, not action. Yet when confronted with its stake in and connections to the fossil fuel industry, the discourse at Harvard rapidly morphs into non-sequiturs and censorship. Harvard’s president suggested to me that if we were to move investments out of fossil fuels, then we might have to do the same for sugar, because sugar is harmful, too. Is this real? For those dying around the world, for those living in cities or societies that face destruction from climate change, how is this anything other than a modern-day “let them eat cake”?

When faced with calls for divestment, another Harvard trustee suggested that we should instead be thanking oil companies like BP for investing in renewable energy—which is awkward, because there’s not a lot of that going on. At what point does “daddy knows best” become “I think daddy might be losing touch with reality”? Have we arrived?

In court, Harvard has formally argued that students’ desire for reduced investments in fossil fuels is as trivial and arbitrary as the desire for a new academic calendar or different housing options. Again, does Harvard truly believe that the existence of species, the stability of societies, and the lives of the vulnerable around the world are choices on the same level as whether to start classes on a Wednesday or a Thursday? When we play dumb, are we being clever and bluffing—or are we fools telling the truth? Which is more terrifying to the future of human society?

Harvard staff members have told me they are prohibited from discussing the issue of fossil fuel divestment at all—even outside of work. Imagine if staff were prohibited from talking about greenhouse gas reductions. When the future depends on our actions today, why is a university suppressing discussion?

Click here to read the rest

Benjamin Franta has a PhD in applied physics from Harvard University and from 2014—2016 was a research fellow at the Belfer Center for Science and International Affairs at the Harvard Kennedy School of Government.



from Skeptical Science http://ift.tt/29gKXA9

One morning in the summer of 2014, I found myself in the city of Tacloban in the Philippines. The city and surrounding area had been devastated less than a year earlier by Super Typhoon Yolanda. Thousands had been killed; bodies were found for months afterwards. 

As part of an international research collaboration, I was interviewing government officials and others throughout the Philippines to assess how to improve preparedness for and response to climate-related disasters. I had already interviewed survivors in cities and villages across the country about the impacts of extreme weather. (And, incidentally, a few weeks later, I would contract dengue and chikungunya—two mosquito-borne diseases aided by climate changein their ongoing spread.) With my prior experience, I thought I was prepared for what I would hear that morning, but I wasn’t.

As I prepared for the day’s interviews, I spoke with a man of about fifty who was helping us to navigate. He described the impact of the storm, the thousands of bodies lying about, his attempts to somehow help despite the overwhelming magnitude of the destruction and death. His own son had gone missing, but there was no time to search; the need for attention to those around him was too immediate and great. The destruction’s scale made the attempted cleanup a kind of futile, obligatory madness—but one that seemed necessary by the standards of human decency. 

The madness, the decency, the inhuman work of cleaning a mountain of death and sadness continued for weeks, until someone informed him that they had found his son. He was miles away, his body in a mangrove patch, decomposing. The father collected his son’s remains, like so many others did, and then returned to the never-ending work. There was too much to do.

And as the father spoke to me, some half a year later, there was still too much to do. The coastline had been reoccupied with shanties. Another typhoon season was coming. The father looked at me, and I could see his eyes. I cannot forget what I saw: trauma, grief, fear…all unprocessed, all repressed and pushed aside for months because there was no time to grieve, no time to come to peace, because there was too much to do; too much to do just to survive, just to live.

A theatre of the absurd

The next spring, I was in Massachusetts, on Harvard’s campus. People were awakening to the dangers of climate change. Massive demonstrations were occurring on campus to protest Harvard’s considerable investments in the fossil fuel sector (which constituted one-third of Harvard’s disclosed investments at the end of 2014). Student and alumni protestors had set up camp around the central administrative building. To avoid the protestors, the administration had moved operations to Loeb House, a small mansion on campus, which was surrounded by barricades and police to prevent protestors from approaching.

The former Harvard professor Cornel West whipped up the crowd with a characteristically fiery speech and led a march to Loeb House to deliver a letter to the administration. Hundreds, including myself, participated. As we approached, I could see administrative staff peering out at us past the velvet curtains.

When we got to the barricades, the police informed us that no one was in the building. Despite the human-looking figures inside poking their heads above the corners of windows to sneak a peak at the rabble outside, the police insisted the building was empty. I remember feeling confused—to be lied to blatantly is more disorienting than to be lied to subtly—and the crowd began to chant, calling for someone to come outside.

As hundreds stayed and chanted for ten, then twenty minutes—calling to the individuals they could see through the windows—individuals who were looking right back while the police insisted that no one was inside—I thought of the father in the Philippines. He did not choose to be surrounded by death; he did not choose to be tasked with the retrieval of his own son’s remains. He was not afforded even the basic privilege of time and space to grieve. He was afforded no choice but to repress his trauma and continue. And I thought of his son, who did not choose death. And yet in that moment I saw those who did have the luxury of choice, those who live lives of comfort, looking down from the windows of a mansion at a crowd whose request was to deliver a letter for the sake of human decency.

And yet, for the people in that house, to come outside to accept such a letter was below them—while hiding from their own students, and lying boldly to them, was not.

Finally—after it was clear that the protestors would not be leaving—someone did emerge from the empty house, accepting the contentious piece of paper and taking it inside. The protestors wanted Harvard to stand up to powerful interests by moving away from its fossil fuel stakes, yet its management was unwilling to accept a simple piece of paper—an arguably much easier task—without a theatre of the absurd.

It was in that moment that I realized that if our children look back to how we failed them, it will not have been for lack of scientific understanding or even technological prowess; it will have been due, fundamentally, to cowardice. A profound cowardice among those who actually do have a choice in this matter, a cowardice that confuses arrogance with intelligence, pettiness with importance, and, most fatally, comfort with necessity. 

Divestment’s controversy

Essentially all of the climate change controversy at Harvard has revolved around divestment. The idea of reducing investments in fossil fuels as a matter of policy began as an audacious suggestion designed to shock people into seeing the contradiction between our words and our actions on climate. After institutions began adopting the idea, it became a method to call attention to theobstructionism and denial propagated by fossil fuel companies. Institutions that were afraid of making enemies in industry—like Harvard and MIT—were, rather predictably, reluctant to take a public stand. But since the Paris climate agreement in 2015, the idea of divestment has evolved into something much more fundamental and unignorable.

In polite society—at least the kind that self-identifies with science—the Paris agreement is applauded, in essence, universally. Yet the implications of the agreement for investments are beginning to be reckoned with, and they are stark: by the IPCC’s most recent estimate, $100 billion per year needs to be disinvested from the fossil fuel extraction industry for the next twenty years. And when it comes to infrastructure, a recent study has found that no new fossil-fuel-using power plants can be built after next year (unless they are decommissioned prematurely—making them a bad investment). In other words, if we are serious about the Paris agreement, then there needs to be a deliberate shift of investments out of fossil fuels and into clean replacements at this moment. This is, technically speaking, the definition of divestment.

The catch, though, is that this is something that Harvard’s administration has vowed never to do. To analyze why is an exercise in theorizing—it may be due to the logic of economic Darwinism that underlies Harvard’s culture and wealth, a psychology of indignant authoritarianism among Harvard’s governing board, pervasive conflicts of interest (Harvard trustee Ted Wells is currently legal counsel for Exxon Mobil, for example), or nothing more than simple bureaucratic group-think—but regardless of the reason, the fact that the richest private university in the world openly defies the Paris agreement with its investment policies—while praising the agreement with words—is troubling. 

And this brings us to an uncomfortable but unavoidable question: does Harvard actually wantto fix climate change, or does it merely want to look like it wants to fix it? And perhaps more troublingly: do we actually want to fix climate change, or are we just going through the motions to save face, to avoid admitting to ourselves that, deep down, we aren’t who we thought we were, that we actually don’t care that much what happens to our children—or what happens to the world?

Fake it ‘til you make it

What does it look like to pretend to care? Harvard has announced that “green is the new crimson” and, to much fanfare, spends a special $1 million per year on climate research. But in the face of a civilizational crisis—and for an institution whose research spending is on the order of a billion dollars per year already—what is the intended purpose of this much-publicized $1 million? Harvard spends the same to pay its president (more than the president of the US)—and fifty times more just to pay half a dozen of its money managers. Meanwhile, Harvard likely has hundreds of millions—or more—invested in fossil fuels. If we look past the fanfare and see the world’s richest private university spending $1 million per year to address a civilizational crisis, congratulating itself while investing hundreds of times more in the root cause of that crisis, are we supposed to feel reassured? Or can this only be interpreted as the most illuminating kind of satire of all—that is, the kind that is real?

It might be suggested that universities are places of discourse, not action. Yet when confronted with its stake in and connections to the fossil fuel industry, the discourse at Harvard rapidly morphs into non-sequiturs and censorship. Harvard’s president suggested to me that if we were to move investments out of fossil fuels, then we might have to do the same for sugar, because sugar is harmful, too. Is this real? For those dying around the world, for those living in cities or societies that face destruction from climate change, how is this anything other than a modern-day “let them eat cake”?

When faced with calls for divestment, another Harvard trustee suggested that we should instead be thanking oil companies like BP for investing in renewable energy—which is awkward, because there’s not a lot of that going on. At what point does “daddy knows best” become “I think daddy might be losing touch with reality”? Have we arrived?

In court, Harvard has formally argued that students’ desire for reduced investments in fossil fuels is as trivial and arbitrary as the desire for a new academic calendar or different housing options. Again, does Harvard truly believe that the existence of species, the stability of societies, and the lives of the vulnerable around the world are choices on the same level as whether to start classes on a Wednesday or a Thursday? When we play dumb, are we being clever and bluffing—or are we fools telling the truth? Which is more terrifying to the future of human society?

Harvard staff members have told me they are prohibited from discussing the issue of fossil fuel divestment at all—even outside of work. Imagine if staff were prohibited from talking about greenhouse gas reductions. When the future depends on our actions today, why is a university suppressing discussion?

Click here to read the rest

Benjamin Franta has a PhD in applied physics from Harvard University and from 2014—2016 was a research fellow at the Belfer Center for Science and International Affairs at the Harvard Kennedy School of Government.



from Skeptical Science http://ift.tt/29gKXA9

Alpine soils storing up to a third less carbon as summers warm

This is a re-post from Robert McSweeney at Carbon Brief

The top metre of the world’s soils contains three times as much carbon as the entire atmosphere. This means that losing carbon from the soil can quicken the pace of human-caused climate warming.

A new paper, published today in Nature Geoscience, finds this is already happening in the forests of the German Alps. Soils there are losing carbon as summer temperatures rise, the researchers say.

In the last three decades, soil carbon across the German Alps has decreased by an average of 14% – and by as much as 32% for certain types of soils.

The findings might be a sign of how soils could amplify warming in future, other scientists say.

Crucial role

Soils play a crucial role in the global carbon cycle. The figure below, from a News & Views article that accompanies the paper, illustrates how carbon is taken up and released by soils.

Plants absorb CO2 from the atmosphere through photosynthesis, and transfer carbon into the ground when dead roots and leaves decompose in the soil. Here, carbon is “immobilised” for anything from a week to thousands of years.

Eventually, the carbon is broken down completely, or “mineralized”, releasing CO2 back into the atmosphere.

Image showing soil carbon cycle

Soil carbon cycle. Source: Kirk et al. (2016).

The researchers collected samples of soil carbon from 24 sites in forests and 11 sites in pastures and meadows across the Alps of southern Germany.

“Set 1” of the sample sites (shown as black dots in the map below) is distributed across much of the German Alps – covering an area of around 4,500 square kilometres. “Set 2” (shown as triangles) is concentrated on a 600 square kilometre area of the Berchtesgaden region.

Map of study sites across Germany

Map of study sites across Germany. Credit: Dr Jörg Prietze.

The scientists chose these sites to match up with samples collected in 1976 and 1987, allowing them to see how carbon levels in the soil has changed over time.

Across the forest sites, they find that levels of soil carbon has decreased by an average of 14% since the first samples were collected.

The size of the decrease is almost identical for the two different locations, the researchers note, with an average decline in carbon of 14.0% for Set 1 and 14.5% for Set 2.

The scientists also find that soils with a higher carbon content to begin with lost more of their carbon over the 30-year study period, averaging 32%.

While the researchers found a decrease in carbon in forest soils, they didn’t find a change in the samples taken from pasture soils.

Carbon appears to be more stable in these soils because of their high mineral content, says Dr Jörg Prietze, lead author of the paper and associate professor of soil science at the Technical University of Munich. The carbon in the soil clings to these minerals and isn’t released into the atmosphere as easily, he explains.

Warming summers

So, what role do rising temperatures play in the decline of soil carbon in the Alps?

Warmer conditions can speed up the turnover of carbon through the soil. Microbes in soils that break down organic carbon work harder in warmer temperatures, releasing more carbon, Prietze explains to Carbon Brief:

“In many soils under a temperate humid climate, an increase of air temperature results in increased microbial soil organic carbon decomposition rates.”

Overall, as conditions in the Alps get warmer, more carbon is lost from the soil than is added back in from dead plants, the paper explains.

Average temperatures between May and October across Set 1 of the sample locations (see earlier map) have increased by 0.5C per decade over the last 25 years, the study says. The equivalent temperature change for Set 2 is 0.3C per decade, but this warming isn’t statistically significant. This means the scientists can’t be certain that the warming hasn’t happened by chance.

The results suggest that forest soils in the German Alps have changed from a net sink of carbon to a net source, says Prietze. This means the soils are now releasing more carbon to the atmosphere than they are taking up.

Prof Guy Kirk, professor of soil systems at Cranfield University and author of the News & Views article, writes that the findings of this “exemplary” monitoring study might be a sign of how soils could amplify warming in future, perhaps triggering a self-reinforcing loop. He writes:

“[The study’s] evidence that climate change has already started depleting soil carbon in the German Alps raises the possibility that a positive feedback between climate and ecosystems is beginning.“

This positive feedback would see warming conditions speed up the release of carbon from the world’s soils, which would in turn warm the climate further.



from Skeptical Science http://ift.tt/299zdM7

This is a re-post from Robert McSweeney at Carbon Brief

The top metre of the world’s soils contains three times as much carbon as the entire atmosphere. This means that losing carbon from the soil can quicken the pace of human-caused climate warming.

A new paper, published today in Nature Geoscience, finds this is already happening in the forests of the German Alps. Soils there are losing carbon as summer temperatures rise, the researchers say.

In the last three decades, soil carbon across the German Alps has decreased by an average of 14% – and by as much as 32% for certain types of soils.

The findings might be a sign of how soils could amplify warming in future, other scientists say.

Crucial role

Soils play a crucial role in the global carbon cycle. The figure below, from a News & Views article that accompanies the paper, illustrates how carbon is taken up and released by soils.

Plants absorb CO2 from the atmosphere through photosynthesis, and transfer carbon into the ground when dead roots and leaves decompose in the soil. Here, carbon is “immobilised” for anything from a week to thousands of years.

Eventually, the carbon is broken down completely, or “mineralized”, releasing CO2 back into the atmosphere.

Image showing soil carbon cycle

Soil carbon cycle. Source: Kirk et al. (2016).

The researchers collected samples of soil carbon from 24 sites in forests and 11 sites in pastures and meadows across the Alps of southern Germany.

“Set 1” of the sample sites (shown as black dots in the map below) is distributed across much of the German Alps – covering an area of around 4,500 square kilometres. “Set 2” (shown as triangles) is concentrated on a 600 square kilometre area of the Berchtesgaden region.

Map of study sites across Germany

Map of study sites across Germany. Credit: Dr Jörg Prietze.

The scientists chose these sites to match up with samples collected in 1976 and 1987, allowing them to see how carbon levels in the soil has changed over time.

Across the forest sites, they find that levels of soil carbon has decreased by an average of 14% since the first samples were collected.

The size of the decrease is almost identical for the two different locations, the researchers note, with an average decline in carbon of 14.0% for Set 1 and 14.5% for Set 2.

The scientists also find that soils with a higher carbon content to begin with lost more of their carbon over the 30-year study period, averaging 32%.

While the researchers found a decrease in carbon in forest soils, they didn’t find a change in the samples taken from pasture soils.

Carbon appears to be more stable in these soils because of their high mineral content, says Dr Jörg Prietze, lead author of the paper and associate professor of soil science at the Technical University of Munich. The carbon in the soil clings to these minerals and isn’t released into the atmosphere as easily, he explains.

Warming summers

So, what role do rising temperatures play in the decline of soil carbon in the Alps?

Warmer conditions can speed up the turnover of carbon through the soil. Microbes in soils that break down organic carbon work harder in warmer temperatures, releasing more carbon, Prietze explains to Carbon Brief:

“In many soils under a temperate humid climate, an increase of air temperature results in increased microbial soil organic carbon decomposition rates.”

Overall, as conditions in the Alps get warmer, more carbon is lost from the soil than is added back in from dead plants, the paper explains.

Average temperatures between May and October across Set 1 of the sample locations (see earlier map) have increased by 0.5C per decade over the last 25 years, the study says. The equivalent temperature change for Set 2 is 0.3C per decade, but this warming isn’t statistically significant. This means the scientists can’t be certain that the warming hasn’t happened by chance.

The results suggest that forest soils in the German Alps have changed from a net sink of carbon to a net source, says Prietze. This means the soils are now releasing more carbon to the atmosphere than they are taking up.

Prof Guy Kirk, professor of soil systems at Cranfield University and author of the News & Views article, writes that the findings of this “exemplary” monitoring study might be a sign of how soils could amplify warming in future, perhaps triggering a self-reinforcing loop. He writes:

“[The study’s] evidence that climate change has already started depleting soil carbon in the German Alps raises the possibility that a positive feedback between climate and ecosystems is beginning.“

This positive feedback would see warming conditions speed up the release of carbon from the world’s soils, which would in turn warm the climate further.



from Skeptical Science http://ift.tt/299zdM7