FSE deputy director David Lobell has been named the William Wrigley Senior Fellow at the Stanford Woods Institute for the Environment and the Freeman Spogli Institute for International Studies (FSI). Lobell is also an Associate Professor in Earth System Science. 

Lobell's research focuses on identifying opportunities to raise crop yields in major agricultural regions, with a particular emphasis on adaptation to climate change. His current projects span Africa, South Asia, Mexico, and the United States, and involve a range of tools including remote sensing, GIS, and crop and climate models.

"David Lobell's research on climate change and food security is truly global in scope, but his work also crosses academic borders," said FSI director Mike McFaul. "David's appointment as William Wrigley Senior Fellow recognizes his ability to connect the most pressing challenges in international  development with critical questions of environmental sustainability, in a way that generates real solutions on both fronts."

The William Wrigley Senior Fellowship is supported by Mrs. Julie Ann Wrigley, AB '71 (Anthropology) and Ms. Alison Wrigley Rusack, AB '80 (Communication).

"The Wrigley fellowship recognizes the important contributions of our faculty to ensuring a sustainable world and is one family’s remarkable legacy to reshape the future of the environment on which we all depend," said Perry L. McCarty Director Barton "Buzz" Thompson, who co-leads the Stanford Woods Institute with Perry L. McCarty Director Jeffrey Koseff.  "Both David and the first holder of the fellowship, Roz Naylor, are leaders in the effort to provide food security to the planet's growing population, perhaps the most critical challenge the world faces."

"David's work already transcends disciplines and departments through his work with the Center on Food Security and the Environment, a synergistic partnership between Woods and the Freeman Spogli Institute," Koseff added. "The Wrigley fellowship provides important support for this type of collaborative, cross-cutting research at Stanford."

Lobell was a Senior Research Scholar at the Center on Food Security and the Environment from 2008-2009 and a Lawrence Post-doctoral Fellow at Lawrence Livermore National Laboratory from 2005-2007. He received a PhD in Geological and Environmental Sciences from Stanford University in 2005, and a Sc.B. in Applied Mathematics, Magna Cum Laude from Brown University in 2000.

A sustainable future is within reach, but it won’t prevent the world from experiencing the potentially catastrophic environmental and political consequences of climate change and environmental degradation, former Secretary of Energy Steven Chu told a Stanford audience.

Chu, who shared the 1997 Nobel Prize in Physics and served as the energy secretary under President Barack Obama from 2009 to 2013, held a seminar at CISAC on Tuesday on climate change, sustainability and security.

The consequences of the damage wrought by unsustainable resource depletion and air pollution will manifest in a hotter, more dangerous world, said the Stanford physics professor.

Average global temperatures have skyrocketed past normal levels since the Industrial Revolution and have plateaued in the last few months at the highest points in history. Chu said the plateau is likely due to it taking a long time for the lower depths of the oceans to warm up.

“There is a built-in time delay between committing damage, which we’ve already done, and feeling the true consequences. All we can say is that temperatures are likely to climb again, we just don’t know when – could be 50 to 100 years – and by how much,” said Chu.

Even if the world were to stop using coal, oil, and natural gas today, he said, it would not stop the oncoming consequences. “It’s like a long-time chain-smoker who stops smoking. Stopping does not necessarily prevent the occurrence of lung cancer.”

Chu said the battle between scientists and the tobacco industry in the 20th century is analogous to today’s conflict between scientists and the energy industries.

“A lot of what you hear from the incumbent energy industries and their representatives are the same kinds of arguments that the tobacco industry made when the science showing the harm cigarettes caused came out,” said Chu.

Ironically, the same science showing the damage cigarettes cause to health can be used to demonstrate the hazards of air pollution today.

Chu noted that a recent study found that for every 10 micrograms of pollution per cubic meter, the chances of contracting lung cancer increases 36 percent. This lends alarming perspective to pollution in places such as China and India.

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The U.S. Embassy in Beijing tracks air pollution levels daily.

“The average level of air pollution was 194 micrograms per cubic meter. So it’s possible that breathing the average air in Beijing is equivalent to smoking a pack of cigarettes a day,” he said. “Even if it’s a third of that, it’s still really bad. But again, there is going to be a lag time between now and a possible rash of deaths by lung cancer.

In addition to causing large-scale health crises, global warming and environmental degradation may exacerbate, or even cause, potential conflicts between countries.

“I think water insecurity concerns me more than even rising sea levels,” said Chu, noting that today’s conflicts in the Middle East and North Africa are exacerbated by water insecurity.

“India is already nervous that China will direct water runoff from the Himalayas to water-starved Northern China and away from India or Bangladesh, which are also water-starved,” he said. “India is also concerned that millions of Bangladeshis could become environmental refugees and start streaming into India.”

Chu recalled that when he was energy secretary, one of his biggest climate-change allies was the Department of Defense

“They will be the ones called on to help with those stresses and they see serious geopolitical risks due to climate change,” he said.

Despite the dangers ahead, Chu is optimistic about great strides in sustainable technology.

Chu and some of his colleagues studied a phenomenon that may bode well for creating a more environmentally friendly economy: putting efficiency standards on electronic appliances, which eventually could lead to a decline in the cost of appliances.

In addition to economical energy standards, new and cheaper green energy technology is within sight. Chu is working with Stanford Professor Yi Cui on creating a lithium-sulfur battery that may be significantly lighter than the current electric batteries used by cars such as Tesla and charge 200 miles in 10 minutes.

Additionally, wind energy is set to become cheaper than natural gas. Chu said that in the Midwest, where the wind is best and cheapest, contracts are selling anywhere between 2.5 and 3 cents per kilowatt-hour. If you build a new natural gas plant, it would be about 5 cents per kilowatt-hour.

“To be fair, wind does have the benefit of a production tax credit and if you take that away, wind would be somewhere around 5.5 cents per kilowatt-hour. But I think within the next dozen years wind will, on its own, be cheaper than natural gas,” he said.

Solar is even more surprising, said Chu. In July 2008, contracts were going for 18 to 20 cents per kilowatt-hour. In Texas in 2014, two contracts were signed one for 5 cents and the other for 4.8 cents per kilowatt-hour. Solar has the advantage of being scalable and the amount of solar resources available around the world is substantial.

“There’s plenty of solar energy available to power the entire world several times over,” he said.

Nonetheless, public policy nudges are still needed.

“There is still no serious discussion in the U.S. about creating a national grid with long distance transmission lines, which will be necessary for a sustainable future. But before that can happen, the campaign by incumbent industries to discredit and doubt climate science has to be defeated.”

FSE director Roz Naylor has been selected to deliver the 6th annual Ned Ames Honorary Lecture at the Cary Institute of Ecosystem Studies in Millbrook, NY on Friday, April 24. Her lecture on "Feeding the World in the 21st Century," is free and open to the public, and a video recording of the event will be available on the Cary Institute's website shortly after the talk.

A chance course at Stanford and a study-abroad trip to Nepal changed the trajectory of Marshall Burke's career, leading him to a human-focused approach studying climate change. His latest work deals with the link between rising temperatures and human violence. 

I pray thee, good Mercutio, let's retire:
The day is hot, the Capulets abroad,
And, if we meet, we shall not scape a brawl;
For now, these hot days, is the mad blood stirring.

That a connection exists between hot temperatures and flaring tempers is an old observation. In William Shakespeare's Romeo and Juliet, Benvolio begs his friend Mercutio to take shelter from the heat, lest it lead to a street fight with a member of the Capulet family.

“Even in Shakespeare’s time, it was recognized that people are more likely to lose their tempers when it’s hot outside,” said Marshall Burke, an assistant professor in the department of Environmental Earth System Science and a fellow at the Freeman Spogli Institute for International Studies and its Center on Food Security and the Environment (FSE).

The link between temperature and violence has come under increased scientific scrutiny in recent years because of climate change. In 2013, Burke made waves in scientific circles and in the popular press when he and Solomon Hsiang, now an assistant professor of public policy at the University of California, Berkeley, performed a meta-analysis of over 50 scientific studies and found that climate change is increasing various kinds of human conflict–everything from individual-level violence, such as assault and robbery, all the way up to group-level conflicts such as civil wars and skirmishes between nations.

"What we see is that over and over, no matter where you look, you see more conflict and more violence when temperatures are hotter than average," Burke said.

Climate change and violence

Prior to Burke and Hsiang's study, several papers had suggested possible links between climate change and violence, but the research was scattered across disciplines and the results often conflicted with one another. The pair sought to cut through the morass by putting all of the papers on an equal empirical footing. "We got a hold of all of the datasets that we could and reanalyzed them in exactly the same way," Burke said. "When we did that, what came through was a very strong and consistent relationship between hotter-than-average temperatures and increases in all these types of conflicts."

We are learning about ourselves and we can shape our trajectories in ways that we wouldn't have been able to if we didn't have this information. To me, that's very hopeful.

Burke says he was surprised by the how strong and consistent the signal was. For example, of the 27 studies from the modern era that looked directly at the relationship between temperature and conflict, all 27 of them found a positive relationship. "The chance of that happening at random or by chance is less than 1 in 10 million,” Burke said.

Burke finds it fascinating that a relationship between temperature and violence should exist at all. Economists have speculated that temperature affects human conflict through changes in economic productivity. The idea is that by increasing the likelihood of droughts in certain parts of the world, climate change is reducing crop productivity and driving people already in dire straits to take desperate measures such as joining rebellions. "In places like Sub-Saharan Africa, you don't need that many people to start a civil war," Burke said.

Human physiology almost certainly plays a key role as well. Studies show that people just behave badly when it’s hot. "Experiments have shown that whether it’s a cooperation task, or one that requires concentration, people just do poorly if it's hotter in the room," Burke said. "We're just wired to do better at some temperatures than at others."

Because global warming is unlikely to abate anytime soon, even if mitigation policies are enacted, understanding why hotter temperatures brings out the worst in humans is crucial for determining solutions to curb violent tendencies as global temperatures rise, Burke said. "If the root cause is agricultural, we might want to invest in things that boost crop yields or that reduces crop sensitivity to really hot temperatures," he added. "If it’s something to do with human physiology, the problem becomes much more difficult. You might say, well we could just invest in air conditioning, but even in the U.S. where we have lots of air conditioning, you still see this strong relationship."

Burke's own background is in economics, but he plans to team up with medical scientists to explore just how temperature affects human physiology. "That's what's exciting about being at Stanford, and one of the main reasons I accepted a position here," Burke said. "It's really easy to cross disciplines here and make connections in other fields."

People-focused

Being interdisciplinary comes naturally to Burke. His undergraduate education at Stanford University straddled the social sciences and the natural sciences. Initially an Earth Systems major, Burke later switched to International Relations after taking a course called "The World Food Economy" that was co-taught by Roz Naylor, the William Wrigley Professor in Earth Science. "I took that class and it literally changed my trajectory. I knew that this kind of human-focused research was what I wanted to do," Burke said.

Burke was also deeply affected by time he spent living in Nepal with poor farming families during his junior year as part of a semester abroad program. "It was my first real confrontation with deep and grinding rural poverty," he said. "That experience made me want to understand what's going on and think about the kind of research I needed to do if I wanted to help."

After graduating, Burke worked as a research assistant for Naylor and Walter Falcon, now the deputy director of FSE, where he helped investigate the impacts of agricultural systems on the environment and ways to use agriculture to reduce poverty around the world.  "Since most of the poor people in the world continue to work in agriculture, our idea was that if we could improve how much was produced on small farms, it would have a big impact on global poverty," Burke said.

Burke also credits Naylor and Falcon with making him think more deeply about the connections between climate change and agriculture. Later, while earning his PhD in agricultural and resource economics at the University of California, Berkeley, Burke's research interests broadened further to look at how climate change effects on agriculture might in turn impact the economic health and social cohesion of a country. "For me, it was a natural to begin by thinking about climate change impacts on agriculture and then following that line of reasoning to investigate other knock-on effects," Burke said.

A silver lining

When Burke is not at Stanford, he can often be found taking photographs or hiking and rock climbing with his family. His office is decorated with photos he’s taken of Death Valley, Yosemite Valley, and Nepal, where he returned with his wife for their honeymoon.

Burke credits the time he spent outdoors as a child for his lifelong interest in environmental issues, and it's a tradition that he continues with his two young girls. "We have two-year-old twins, and my wife and I have little harnesses that we use to take them rock climbing. So far they're more interested in swinging around on the rope than in actually climbing, but it's fun," he said.

Burke says the time he spends in the mountains and deserts are not just for his own mental well being and happiness. “It’s a constant reminder about the things I work on and what’s at stake,” he said.

Marshall Burke and his wife rocking climbing with their two-year-old daughter at Joshua Tree.

He acknowledged that many of the predictions from climate change impact studies are frightening and depressing, but he thinks there is a silver lining that often gets overlooked. "We live in a unique moment in history when we have a wealth of tools and data that can help us understand how human societies and the environment are coupled," Burke said.

"We are learning about ourselves and we can shape our trajectories in ways that we wouldn't have been able to if we didn't have this information. To me, that's very hopeful."

Burke is also a fellow at the Center on Food Security and the Environment (FSE) and a fellow at the Freeman Spogli Institute for International Studies.

Ker Than is associate director of communications for the School of Earth, Energy & Environmental Sciences. Contact: 650-723-9820, kerthan@stanford.edu