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Scientists identify new implications of perennial bioenergy crops

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David Lobell
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A team of researchers from Stanford University, the Carnegie Institution for Science, and Arizona State University has found that converting large swaths of land to bioenergy crops could have a wide range of effects on regional climate.

In an effort to help wean itself off fossil fuels, the U.S. has mandated significant increases in renewable fuels, with more than one-third of the domestic corn harvest to be used for conversion to ethanol by 2018. But concerns about effects of corn ethanol on food prices and deforestation had led to research suggesting that ethanol be derived from perennial crops, like the giant grasses Miscanthus and switchgrass. Nearly all of this research, though, has focused on the effects of ethanol on carbon dioxide emissions, which drive global warming.

"Almost all of the work performed to date has focused on the carbon effects," said Matei Georgescu, a climate modeler working in ASU's Center for Environmental Fluid Dynamics. "We've tried to expand our perspective to look at a more complete picture.  What we've shown is that it's not all about greenhouse gases, and that modifying the landscape can be just as important."

Georgescu and his colleagues report their findings in the current issue (Feb. 28, 2011) of the Proceedings of the National Academy of Sciences (see Direct Climate Effects of Perennial Bioenergy Crops in the United States). Co-authors are David Lobell of Stanford University's Program on Food Security and the Environment and Christopher B. Field of the Carnegie Institution for Science, also located in Stanford, California.

In their study, the researchers simulated an entire growing season with a state-of-the-art regional climate model. They ran two sets of experiments - one with an annual crop representation over the central U.S. and one with an extended growing season to represent perennial grasses. In the model, the perennial plants pumped more water from the soil to the atmosphere, leading to large local cooling. 

"We've shown that planting perennial bioenergy crops can lower surface temperatures by about a degree Celsius locally, averaged over the entire growing season. That's a pretty big effect, enough to dominate any effects of carbon savings on the regional climate." said Lobell.

The primary physical process at work is based on greater evapotranspiration (combination of evaporated water from the soil surface and plant canopy and transpired water from within the soil) for perennial crops compared to annual crops. 

"More study is needed to understand the long-term implication for regional water balance." Georgescu said. "This study focused on temperature, but the more general point is that simply assessing the impacts on carbon and greenhouse gases overlooks important features that we cannot ignore if we want a bioenergy path that is sustainable over the long haul."

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Direct Climate Effects of Perennial Bioenergy Crops in the United States

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Biomass-derived energy offers the potential to increase energy security while mitigating anthropogenic climate change, but a successful path toward increased production requires a thorough accounting of costs and benefits. Until recently, the efficacy of biomass-derived energy has focused primarily on biogeochemical consequences. Here we show that the biogeophysical effects that result from hypothetical conversion of annual to perennial bioenergy crops across the central United States impart a significant local to regional cooling with considerable implications for the reservoir of stored soil water. This cooling effect is related mainly to local increases in transpiration, but also to higher albedo. The reduction in radiative forcing from albedo alone is equivalent to a carbon emissions reduction of 78 t C ha-1 , which is six times larger than the annual biogeochemical effects that arise from offsetting fossil fuel use. Thus, in the near-term, the biogeophysical effects are an important aspect of climate impacts of biofuels, even at the global scale. Locally, the simulated cooling is sufficiently large to partially offset projected warming due to increasing greenhouse gases over the next few decades. These results demonstrate that a thorough evaluation of costs and benefits of bioenergy-related land-use change must include potential impacts on the surface energy and water balance to comprehensively address important concerns for local, regional, and global climate change.

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Matei Georgescu
David Lobell
Christopher B. Field
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John Tasioulas on justifying human rights

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On February 15, Professor John Tasioulas of the Faculty of Law at University College London spoke during the sixth session of the Sanela Diana Jenkins Speaker Series hosted by the Program on Human Rights at Stanford's Center on Democracy, Development, and the Rule of Law. A former Reader of Moral and Legal Philosophy at Oxford, Tasioulas discussed the moral philosophy that underpins human rights.

In his presentation entitled "The Justification of Human Rights," Tasioulas argued that the contemporary notion of human rights cannot be seen solely as a political movement, but instead must be considered from a moral perspective. Tasioulas defined human rights as "natural rights," possessed by all humans by virtue of their humanity and discovered through ordinary moral reasoning.  

Because the philosophical core of human rights is derived from the very fact that one is human, he argued that there is universality to this doctrine. Tasioulas contested that moral philosophy behind human rights provides the language and understanding with which society can distinguish between the so-called "good guys" and human rights violators or "bad guys."

Tasioulas argued that this moral basis of human rights provides a better and clearer understanding of what are and what are not human rights. He highlighted the confusion between human rights and human interests often seen in policy-making and academic literature. For example, he underscored that there is a difference between the human right to water and the human interest, or desire, for freedom of speech. While allowing that this served as an exaggerated example, he highlighted the importance of differentiating between human interests - that which makes life better - and human rights - that which is guaranteed to all humans.

At their core, he claimed, human rights are the result of the moral understanding of right and wrong - an understanding that can improve the lives of many around the world.   

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Numerical Modeling of Aquaculture Dissolved Waste Transport in a Coastal Embayment

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Marine aquaculture is expanding rapidly without reliable quantification of effluents. The present study focuses on understanding the transport of dissolved wastes from aquaculture pens in near-coastal environments using the hydrodynamics code SUNTANS (Stanford Unstructured Nonhydrostatic Terrain-following Adaptive Navier-Stokes Simulator), which employs unstructured grids to compute flows in the coastal ocean at very high resolution. Simulations of a pollutant concentration field (in time and space) as a function of the local environment (bathymetry), flow conditions (tides and wind-induced currents), and the location of the pens were performed to study their effects on the evolution of the waste plume. The presence of the fish farm pens cause partial blockage of the flow, leading to the deceleration of the approaching flow and formation of downstream wakes. Results of both the near-field area (area within 10 to 20 pen diameters of the fish-pen site) as well as far-field behavior of the pollutant field are presented. These detailed results highlight for the first time the importance of the wake vortex dynamics on the evolution of the near-field plume as well as the rotation of the earth on the far-field plume. The results provide an understanding of the impact of aquaculture fish-pens on coastal water quality.

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Environmental Fluid Mechanics
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Rosamond L. Naylor
Jeffrey R. Koseff
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FSE senior fellow Scott Rozelle on China's ability to meet increasing demand

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Scott Rozelle
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OMAHA (DTN) -- China is the world's No. 1 producer and consumer of pork and poultry, producing more than five times the pork raised in the U.S. and 80 percent as much poultry. With its economic growth and increasing middle class, it is inevitable that meat consumption will rise.

The question is: Will China be able to continue to boost production sufficiently to meet that demand? The answer has implications for U.S. grain and meat producers.

"Rapidly rising incomes will have wrenching effects on the demand for food," said Scott Rozelle, agricultural economist at Stanford University. "As increasingly well-off consumers get fewer of their calories from rice and wheat, they will demand more from high-value products such as meat, fish, dairy and fruit. Urbanization has similar impacts, dampening the demand for rice and wheat and raising the demand for meat, fish, dairy and fruit. Trying to meet these rising -- and shifting -- demands will pose a large challenge."

Most importantly, given the great constraints China faces in arable land and water, the government has chosen to focus its agriculture in two ways: staple food crops such as rice and oilseeds and value-added products, said Francis Tuan, with USDA's Foreign Agriculture Service. It is aiming for a high percentage of self-sufficiency in staples to ensure its population doesn't go hungry. On the other hand, it wants to garner as much economic growth from agricultural production as possible.

"China is exporting more labor-intensive fruits and vegetables and higher-value commodities, while it is importing more land-intensive agricultural commodities, such as soybeans, cotton, sugar and dairy," Rozelle added. "These shifts are obviously more in line with China's comparative advantage."

One example of that trend is China's purchases of raw soybeans to be crushed in China for oil. Another is some farmers leaving crop production to focus on livestock.

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Connecting the Dots: The Food, Energy, Water, and Climate Nexus

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Stanford experts from a range of disciplines discuss the interconnections and interactions among humanity's needs for and use of food, energy, water, and environment. Drawing on their own research, the speakers will illustrate and evaluate some of the ways in which decisions in one resource area can lead to trade-offs or co-benefits in others. Symposium attendees participate in breakout sessions, led by Stanford students and faculty, on a range of challenges associated with sustainable food systems.

Stanford faculty participants include: Stacey Bent (Center on Nanostructuring for Efflicient Energy Conversion) Welcome; Roz Naylor (Program on Food Security and the Environment, Woods Institute for the Environment) The Global Food Challenge; Chris Field (Carnegie Institution Department of Global Ecology) The Food-Energy Nexus; David Lobell (Program on Food Security and the Environment, Woods Institute for the Environment) The Food-Climate Nexus; Buzz Thompson (Woods Institute for the Environment) The Food-Water Nexus; Mariano-Florentino Cuellar (Center for International Security and Cooperation, Freeman Spogli Institute for International Studies) The Food-Security Nexus; and Pamela Matson (School of Earth Sciences) The Way Forward. Breakout session topics include how to lower the carbon footprint of food, aquaculture, and how to make meat more sustainable.

Bishop Auditorium
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Rosamond L. Naylor

The Jerry Yang and Akiko Yamazaki
Environment and Energy Building
Stanford University
473 Via Ortega, Office 363
Stanford, CA 94305

(650) 723-5697 (650) 725-1992
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Senior Fellow, Stanford Woods Institute and Freeman Spogli Institute for International Studies
William Wrigley Professor of Earth System Science
Senior Fellow and Founding Director, Center on Food Security and the Environment
Roz_low_res_9_11_cropped.jpg PhD

Rosamond Naylor is the William Wrigley Professor in Earth System Science, a Senior Fellow at Stanford Woods Institute and the Freeman Spogli Institute for International Studies, the founding Director at the Center on Food Security and the Environment, and Professor of Economics (by courtesy) at Stanford University. She received her B.A. in Economics and Environmental Studies from the University of Colorado, her M.Sc. in Economics from the London School of Economics, and her Ph.D. in applied economics from Stanford University. Her research focuses on policies and practices to improve global food security and protect the environment on land and at sea. She works with her students in many locations around the world. She has been involved in many field-level research projects around the world and has published widely on issues related to intensive crop production, aquaculture and livestock systems, biofuels, climate change, food price volatility, and food policy analysis. In addition to her many peer-reviewed papers, Naylor has published two books on her work: The Evolving Sphere of Food Security (Naylor, ed., 2014), and The Tropical Oil Crops Revolution: Food, Farmers, Fuels, and Forests (Byerlee, Falcon, and Naylor, 2017).

She is a Fellow of the Ecological Society of America, a Pew Marine Fellow, a Leopold Leadership Fellow, a Fellow of the Beijer Institute for Ecological Economics, a member of Sigma Xi, and the co-Chair of the Blue Food Assessment. Naylor serves as the President of the Board of Directors for Aspen Global Change Institute, is a member of the Scientific Advisory Committee for Oceana and is a member of the Forest Advisory Panel for Cargill. At Stanford, Naylor teaches courses on the World Food Economy, Human-Environment Interactions, and Food and Security. 

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Christopher B. Field

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Perry L. McCarty Director of the Stanford Woods Institute for the Environment.; Professor for Interdisciplinary Environmental Studies, School of Earth, Energy & Environmental Sciences; FSI Senior Fellow, by courtesy
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Chris Field is the Perry L. McCarty Director of the Stanford Woods Institute for the Environment.

His research focuses on climate change, ranging from work on improving climate models, to prospects for renewable energy systems, to community organizations that can minimize the risk of a tragedy of the commons.

Field has been deeply involved with national and international scale efforts to advance science and assessment related to global ecology and climate change. He served as co-chair of Working Group II of the Intergovernmental Panel on Climate Change from 2008-2015, where he led the effort on the IPCC Special Report on “Managing the Risks of Extreme Events and Disasters to Advance Climate Change Adaptation” (2012) and the Working Group II contribution to the IPCC Fifth Assessment Report (2014) on Impacts, Adaptation, and Vulnerability.

Field assumed leadership of the Stanford Woods Institute for the Environment in September 2016. His other appointments at Stanford University include serving as the Melvin and Joan Lane Professor for Interdisciplinary Environmental Studies in the School of Humanities and Sciences; Professor of Earth System Science in the School of Earth, Energy & Environmental Sciences; and Senior Fellow with the Precourt Institute for Energy. Prior to his appointment as Woods' Perry L. McCarty Director, Field served as director of the Carnegie Institution for Science's Department of Global Ecology, which he founded in 2002. Field's tenure at the Carnegie Institution dates back to 1984.

His widely cited work has earned many recognitions, including election to the U.S. National Academy of Sciences, the Max Planck Research Award, the American Geophysical Union’s Roger Revelle Medal and the Stephen H. Schneider Award for Outstanding Science Communication. He is a fellow of the American Academy of Arts and Sciences, the American Association for the Advancement of Science, and the Ecological Society of America.

Field holds a bachelor’s degree in biology from Harvard College and earned his Ph.D. in biology from Stanford in 1981.

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David Lobell

Energy and Environment Building
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(650) 721-6207
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Professor, Earth System Science
Senior Fellow at the Freeman Spogli Institute for International Studies
Senior Fellow at the Stanford Woods Institute for the Environment
Senior Fellow at the Stanford Institute for Economic Policy Research (SIEPR)
Affiliate, Precourt Institute of Energy
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David Lobell is the Benjamin M. Page Professor at Stanford University in the Department of Earth System Science and the Gloria and Richard Kushel Director of the Center on Food Security and the Environment. He is also the William Wrigley Senior Fellow at the Stanford Woods Institute for the Environment, and a senior fellow at the Freeman Spogli Institute for International Studies (FSI) and the Stanford Institute for Economic Policy and Research (SIEPR).

Lobell's research focuses on agriculture and food security, specifically on generating and using unique datasets to study rural areas throughout the world. His early research focused on climate change risks and adaptations in cropping systems, and he served on the Intergovernmental Panel on Climate Change (IPCC) Fifth Assessment Report as lead author for the food chapter and core writing team member for the Summary for Policymakers. More recent work has developed new techniques to measure progress on sustainable development goals and study the impacts of climate-smart practices in agriculture. His work has been recognized with various awards, including the Macelwane Medal from the American Geophysical Union (2010), a Macarthur Fellowship (2013), the National Academy of Sciences Prize in Food and Agriculture Sciences (2022) and election to the National Academy of Sciences (2023).

Prior to his Stanford appointment, Lobell was a Lawrence Post-doctoral Fellow at Lawrence Livermore National Laboratory. He holds a PhD in Geological and Environmental Sciences from Stanford University and a Sc.B. in Applied Mathematics from Brown University.

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A project to advance the science that guides investment in food security and crop productivity, and to effectively communicate this science to a broad audience.
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Barton H. Thompson

Jerry Yang & Akiko Yamazaki Environment & Energy Bldg.
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(650) 723-3402
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Robert E. Paradise Professor of Natural Resources Law
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A leading expert in environmental and natural resources law and policy, Barton H. “Buzz” Thompson, Jr., JD/MBA ’76 (BA ’72), has contributed a large body of scholarship on environmental issues ranging from the future of endangered species and fisheries to the use of economic techniques for regulating the environment. He is the founding director of the law school’s Environmental and Natural Resources Program, Perry L. McCarty Director and senior fellow of the Woods Institute for the Environment, and a senior fellow (by courtesy) at the Freeman Spogli Institute for International Studies. In 2008, the Supreme Court appointed Professor Thompson to serve as the special master in Montana v. Wyoming (137 Original). Professor Thompson is chairman of the board of the Resources Legacy Fund and the Resources Legacy Fund Foundation, a California trustee for The Nature Conservancy, and a board member of both the American Farmland Trust and the Sonoran Institute. He previously served as a member of the Science Advisory Board for the U.S. Environmental Protection Agency.

Before joining the Stanford Law School faculty in 1986, he was a partner at O’Melveny & Myers in Los Angeles and a lecturer at the UCLA School of Law. He was a law clerk to Chief Justice William H. Rehnquist ’52 (BA ’48, MA ’48) of the U.S. Supreme Court and Judge Joseph T. Sneed of the U.S. Court of Appeals for the Ninth Circuit.

Senior Fellow, Stanford Woods Institute for the Environment, and (by courtesy) the Freeman Spogli Institute for International Studies
Barton H. Thompson Speaker
Mariano-Florentino Cuéllar Speaker
Pamela A. Matson Dean of the School of Earth Sciences, Goldman Professor of Geological and Environmental Sciences and FSI Senior Fellow Speaker Stanford University
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Ten Years of Failed Transition to Democracy in Mexico: The Struggle between Modernity and Feudalism in Society

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Antonio Purón was a senior partner of McKinsey & Company in the Mexico Office until January 2008.  His 27 year practice concentrated on serving clients in the energy, chemicals and petrochemicals sectors in Mexico, the United States, Argentina, Brazil, Chile and Venezuela.  In addition, he led work for clients in the financial institutions, consumer goods, retail, water, construction, transportation, manufacturing and telecommunications industries. 

In Mexico he served government and contributed to the modernization and deregulation of the national electric system and the E & P division of the national oil company, and has collaborated in the evolution of the country's basic infrastructure, such as gas distribution, municipal water utilities, ports, toll roads, and solid waste disposal.  His practice comprises both working for authorities and state-owned companies as well as with private investors interested in participating in sectors recently deregulated.

In the industrial and financial sectors he led projects for major national groups and global corporations, focused on strategic planning and growth, operations improvement, organization and process redesign, optimization and diversification of their product and market portfolios in light of the new competitive environment.  In the consumer goods industry he served the leading national companies and global corporations in projects aimed at designing their growth strategy through mergers and acquisitions, partnerships, entry to new markets as well as into other businesses and categories, and e-commerce, valuation of companies, and organizational restructuring.  In retail he collaborated with the major building materials and supermarket chains in Mexico helping to design their growth strategy, improve the performance of their process management, direct sales force management and develop and implement marketing and pricing strategies.

He has authored contributions on productivity and International competitiveness, and collaborated with several higher-education, cultural, arts, non-for-profit and social service institutions.  He is a founding member of Metropoli 2025 and of the board of Universidad Iberoamericana, Promujer, the National Arts Museum and of Instituto de Fomento e Investigación Educativa. He has authored several articles on urban productivity.

Prior to joining McKinsey, Mr. Purón worked at the Department of Special Studies of Ingeniería Panamericana, at the Instituto Mexicano del Petróleo, and at Polioles, S. A., where he had experience in planning, technological evaluation, systems development and project control.

He holds a B.S. in Chemical Engineering (Summa Cum Laude) from the Universidad Iberoamericana, and was a candidate for the master's degree in Chemistry.  He also earned an M.B.A. from Stanford University.

Since retirement Antonio is devoting the bulk of his time to three projects he is passionate about:  1) Giving a high-quality alternative to children currently dependent an poor-quality public basic education so that they can become competitive in a global society, 2) Influencing public policy to revert the current vicious circle of agricultural policies-extreme poverty-migration and 3) Changing the monopolistic control that political parties' leaderships exert on the political process in Mexico.

He is currently an associate fellow of CIDAC (independent think-tank) and participates in the boards of Banco Santander, Nadro, S.A. (JV of McKesson in Mexico), Munal (National Arts Museum), Progresemos (agricultural microfinance) and Centro de Colaboración Cívica (chapter of Partners for Democratic Change).

 

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