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In 2007, "solar market gardens" were installed in 2 villages for women’s agricultural groups as a strategy for enhancing food and nutrition security. Data were collected through interviews at installation and 1 year later from all women’s group households (30–35 women/group) and from a random representative sample of 30 households in each village, for both treatment and matched-pair comparison villages. Comparison of baseline and endline data indicated increases in the variety of fruits and vegetables produced and consumed by SMG women’s groups compared to other groups. The proportion of SMG women’s group households engaged in vegetable and fruit production significantly increased by 26% and 55%, respectively (P < .05). After controlling for baseline values, SMG women’s groups were 3 times more likely to increase their fruit and vegetable consumption compared with comparison non-women’s groups (P < .05). In addition, the percentage change in corn, sorghum, beans, oil, rice and fish purchased was significantly greater in the SMG women’s groups compared to other groups. At endline, 57% of the women used their additional income on food, 54% on health care, and 25% on education. Solar Market Gardens have the potential to improve household nutritional status through direct consumption and increased income to make economic decisions.
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Food and Nutrition Bulletin
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Rosamond L. Naylor
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  • We explored the potential to colocate solar installations and agriculture.
  • Water use at solar installations are similar to amounts required for desert plants.
  • Co-located systems are economically viable in some areas.
  • Colocation can maximize land and water use efficiency in drylands.

Solar energy installations in arid and semi-arid regions are rapidly increasing due to technological advances and policy support. Although solar energy provides several benefits such as reduction of greenhouse gases, reclamation of degraded land, and improved quality of life in developing countries, the deployment of large-scale renewable energy infrastructure may negatively impact land and water resources. Meeting the ever-expanding energy demand with limited land and water resources in the context of increasing demand for alternative uses such as agricultural and domestic consumption is a major challenge. The goal of this study was to explore opportunities to colocate solar infrastructures and agricultural crops to maximize the efficiency of land and water use. We investigated the energy inputs/outputs, water use, greenhouse gas emissions, and economics of solar installations in northwestern India in comparison to aloe vera cultivation, another widely promoted and economically important land use in these systems. The life cycle analyses show that the colocated systems are economically viable in some rural areas and may provide opportunities for rural electrification and stimulate economic growth. The water inputs for cleaning solar panels are similar to amounts required for annual aloe productivity, suggesting the possibility of integrating the two systems to maximize land and water use efficiency. A life cycle analysis of a hypothetical colocation indicated higher returns per m3 of water used than either system alone. The northwestern region of India has experienced high population growth in the past decade, creating additional demand for land and water resources. In these water-limited areas, coupled solar infrastructure and agriculture could be established in marginal lands with low water use, thus minimizing the socioeconomic and environmental issues resulting from cultivation of economically important non-food crops (e.g., aloe) in prime agricultural lands.

 

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Applied Energy
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Sujith Ravi
David Lobell
Christopher B. Field
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The Stanford Center for Sustainable Development and Global Competitiveness (CSDGC) held its 2015 Annual Partner Meeting on May 16 at SCPKU.  The meeting included a discussion on innovation-driven sustainable industrial development and upgrades with a focus on smart learning, the application of green technology in building a smarter society, and smart manufacturing and operation in the industrial transformation.  Participants also exchanged ideas about CSDGC's future development in China.  Attendees included CSDGC Affiliate companies, representatives from collaborating universities, and visiting scholars.

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It is August again, and my wife and I are back on our farm. We have a medium-sized operation in east-central Iowa that produces soybeans, alfalfa, and corn, and that also supports an Angus cow-calf herd. These summers are supposed to be quiet, relaxing times away from the bustle of Stanford University. However, the days here seem anything but tranquil.  Two years ago my almanac report dealt with one of the worst droughts in Iowa’s history; last year the focus was on flooding and the wettest planting season on record.  I suppose it is only fair that wind should be the main topic this year. For our rural neighborhood, only problems, not answers, seemed to have been blowin’ in it.

Two evenings after our arrival from California, we were sent scurrying to our doubly reinforced “safe” room in the basement. Warning sirens blared, all television stations went on emergency broadcasting, and the spontaneous neighborhood phone line magically got activated.  Everything was for real, and all hell broke loose.  Eighty-five m.p.h. flat-line winds, grape-sized hail, and buckets of rain.  The power went out, and our safe-room conversation centered on whether or not to start our small generator—not for lights, but to assure that the sump pump continued working!

For a swath three miles wide and 15 miles long the tornado danced—jumping here and skipping there. Some farms were spared; others were pretty much demolished.  We were moderately lucky.  We lost an infinite number of branches and our largest oak tree—a four-foot diameter, 70-foot tall specimen. Entire trees were twisted off like toothpicks. Shingles from roofs went missing, as did white fencing. But we were among the lucky ones—no major buildings were lost and no people or animals were injured.

Two farms over, the five-bin corn storage unit took a direct hit. Two 120-foot tall elevators that lift grain to the top (called legs, although the anatomy analogy makes no sense) lay in a crumpled mess.  These bins hold some 240,000 bushels of corn and there are massive amounts of steel involved. The broken legs looked, at 120X scale, like an angry third-grader had deliberately slammed his Lego creations onto the ground. The difference is that the repairs, labor costs, and replacement parts for the bins and legs total $750,000. Farmers soon began re-reading their insurance policies about acts of God, depreciation allowances, and the rules for full versus partial replacement.

The morning following the storm, an eerie calm was soon replaced by a different form of energy.  Other work seemed to stop in a region larger than the storm-hit area.  No one arranged it, but neighbors suddenly appeared at each other’s farmsteads with tractors, loaders, pickups, and chainsaws. Small mountains of brush, trees, and building parts began to emerge, to be burned at a later date—no doubt with generous burn permits being granted by the county.

At the time of the storm, corn was about waist high. Like the trees, it took a serious beating throughout the storm’s path.  The corn stalks were tightly packed in narrow rows as a consequence of the changed density of planting—from 20,000 kernels per acre 20 years ago to 35,000 currently.  (Bags of seed corn containing 80,000 kernels now typically sell in excess of $300, putting seed costs per acre about on a par with the cost of nitrogen fertilizer.) This tightly woven carpet of corn was now leaning at 45 degrees—or worse.  The question was whether the stalks would straighten up. And the answer turns out to be “sort of.”  Many of them are “goose-necked,” a much used word now in farmer conversations. The concern is, IF large ears develop, will the stalks be sturdy enough to support them? Or, will a large amount of “ear droppage” seriously reduce yields and profits? We continue to be optimistic, and are still hoping for corn yields of 190 bushels per acre, not far from our best year of 220 bushels.

Morning coffee conversations at the old limestone café have been fairly somber affairs this summer. (The general store has changed hands, but unfortunately, the watery coffee and the stale cookies have not improved.)  Farmer faces were grim even before the storm, mainly because of what has happened to corn prices.  In August 2012, local farmers were being offered $7.65/bushel [56 pounds] of corn; in August 2013, the price was $6.20/bushel, and on August 20, 2014, the price was $3.60/bushel.  Suddenly the rush to buy new pick-ups and large harvesting equipment slowed drastically.  John Deere, the major farm-equipment manufacturer, has already laid off hundreds of workers at various Iowa sites.

Orders have not stopped entirely, however, largely because of crop insurance.  Virtually all farmers have either 75% or 85% revenue protection. If a combination of yield and/or price declines cause revenue to be less than 75% (85%) of normal, farmers are reimbursed by private insurance companies. The premiums for this revenue-protection insurance are heavily subsidized by the federal farm program. Taxpayers underwrite more than 60% of the total insurance premiums, which last year resulted in subsidies to farmers of about $9 billion. Historic yields are used in the insurance contract, and this year the early insurance lock-in price was $4.62/bushel. That price looked low in the spring, but now looks extremely favorable.  Unfortunately, many of my neighbors chose the “wrong” insurance option. They were able to purchase 75% revenue protection for about $4.50/acre, whereas the 85% protection cost about $19/acre. For a farmer with 1500 acres of corn, the difference in insurance premiums was more than $20,000.  But given declining corn prices, the cheaper insurance option for 2014 will surely turn out to be the most costly choice at the end of the season.  Farm decision making these days is mostly about risk management, and that is why crop insurance was such a big element in the new farm program.

Perhaps the hottest topic of conversation at morning coffee centered again on wind, but not of the tornado variety.  It turns out that “the wind comes sweeping down the plain” in Iowa as well as in Oklahoma. Iowa is the third-largest producer of wind energy, and wind power supplies a hefty 27 percent of Iowa’s total energy use. So why are my neighbors upset?  It is something called the Rock Island Clean Line (RICL), and a bit of history is in order.
 

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The old Rock Island Line was a rail company—made more famous than it really deserved to be by Johnny Cash. The line ran five miles south of our farm, and yes, it was a “mighty fine line” that did carry cows, sheep, pigs, and mules. But it went bankrupt in 1975. The Rock Island Clean Line originally planned to use some of the old right-of- way for quite a different purpose—transporting wind-generated power from northwest Iowa on huge towers, with cables carrying direct-current electricity into the Illinois market to the east. It turned out, however, that too much of the old right of way went through urban areas and was unsuitable, so RICL will purchase some 500 linear miles of farmland right-of-way for the towers.

Farmers are rationally and irrationally furious. (The line was originally scheduled to go across the full length of our farm, so we have been directly involved in the discussions.) It has been extremely difficult to get straight answers about the line, with the company and the Iowa Utilities Board doing a dance in which neither wants to lead. There is no doubt that these140-foot towers create an ugly line of sight; they complicate farming with large machinery; and they seriously impact adjoining fields during the construction phase.  The company believes that it is offering generous one-time compensation—the equivalent of $10,000 to $15,000 per acre in most cases—but it then retains easement rights to this land forever, including the authority to sell the rights. Farmers are livid—they basically do not want the line from which they will receive no benefits—but they are being faced with potential eminent domain proceedings if they do not agree to sell. All sorts of NIMBY arguments are being brought forward, from the “government can’t tell us what to do,” to “the lines will emit electrical forces that will cause health effects,” to “they are not paying enough,” to “why should we use good Iowa soil to transport electricity rather than to produce food for the hungry?” The last of these comments is the one I have heard most often. When I inquired as to whether the coffee group was also against ethanol—since 40% of Iowa corn is going into gas tanks rather than hungry mouths—I was NOT regarded as a helpful contributor to the conversation!

In the end, I suspect that the Rock Island Clean Line will prevail, and that farmers and their families will learn to accommodate the power towers. Many farmers will grumble publically, but smile privately en route to their banks with rather large checks. However, both the process and outcome have stirred up deep passions about who controls the land.

Not all farmers are sad this summer, and the winds of good fortune have blown in the direction of cattle feeders.  The structure of cattle feeding in Iowa has changed enormously in recent times. I am the son of a mid-sized feeder, and spent a good deal of my youth working with cattle and driving cattle trucks.  Most east Iowa farms these days are strictly grain farms, in large part to free farmers from the 24/7 burden of animal care. My neighbor talks about his corn-Texas crop rotation—growing corn in the summer and going to Texas for the winter.
 

Two black angus calves.


There are only two large cattle feeding operations left in Linn County where I live, and both are within four miles of our farm.  I was invited by one of the owners to attend a cattle auction with him, and to see for myself just how much things had changed.  He owns his own 18-wheeler, and almost every week takes a load (36 head) of prime beef to the auction.  Cattle are taken to the auction pens the night before the sale and are taken off of feed and water. These steers weigh between 1400 and 1500 pounds, and buyers want assurance that the animals have not gorged on feed and water just before crossing the scales. The cattle are weighed early the morning of the sale, and weights are then flashed on a scoreboard as the animals enter the sale ring.

There is still an amazing amount of ritual at a cattle auction—I had forgotten just how much! Prime steers are typically sold in lots of 12 animals. They enter the ring from one side, and are moved about by a “ring man” so that buyers can get a good view of them. Part of the ritual is where various people sit.  A small group of farmers/sellers sits in one section, typically bantering about whom has the best cattle and whose will “top the sale.” The buyers sit near the top of the bleachers, in the same spot each week, but separated from each other.  (They would not want a casual conversation between them to be construed as collusion!) There is also the auctioneer with his chatter, mile-a-minute delivery, and selling antics. The sale itself happens very rapidly. There are typically two to four bidders for a particular lot of animals, and the bids go back and forth among them at lightning speed. The bidding cues are highly personalized—one buyer uses the flip of his tally sheet, another raises his index finger, and one simply arches his eyebrow.  In less than 45 seconds, the winning buyer has spent $27,000! And then the next lot appears.  Cattle from this sale went to packing plants in Wisconsin, Iowa, Nebraska, and Illinois.

On the 25-mile ride home, my neighbor talked about how pleased he was with what had happened. His steers had gained well and had topped the market in terms of price at $1.57 per pound. He said that corn was very cheap, as was distiller’s grain—the high protein by-product from making corn-based ethanol—which is now an important part of cattle feeding rations. There would be a healthy profit from this load of steers that had grossed about $80,000. 

But then he turned somber.  What should he do about next year? The price of 600-pound calves that he would put into the feedlot for feeding and sale next year are selling at the astronomical price of $2.50 per pound and even higher.  Perhaps next year, he said, was the year to stay out of the ring and go to Texas or Arizona for the winter. Risk had reared its ugly head once again. But my neighbor is first and foremost a cattle feeder, with a cattle feeder’s mindset toward risk. My conjecture is that he will somehow find a rationale for purchasing replacement calves, and that he will do everything all over again next year.                                                 

“The answer my friend, is blowin’ in the wind,

The answer is blowin’ in the wind.”

(Bob Dylan, 1962)

 

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Stanford-Sasakawa Peace Foundation New Channels Dialogue 2014

Energy Challenge and Opportunities for the United States and Japan

 

February 13, 2014

Bechtel Conference Center, Encina Hall, Stanford University

Sponsored and Organized by Sasakawa Peace Foundation (SPF) and Shorenstein Asia-Pacific Research Center (S-APARC) in Association with U.S.-Japan Council

 

Japan Studies Program at Shorenstein APARC, Stanford University has launched a three-year project from 2013 to create new channels of dialogue between experts and leaders of younger generations from the United States, mostly from the West Coast, and Japan under a name of "New Channels: Reinvigorating U.S.-Japan Relations," with the goal of reinvigorating the bilateral relationship through the dialogue on 21st century challenges faced by both nations, with a grant received from the Sasakawa Peace Foundation.

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Frontiers in Food Policy: Perspectives on sub-Saharan Africa is a compilation of research stemming from the Global Food Policy and Food Security Symposium Series, hosted by the Center on Food Security and the Environment at Stanford University and funded by the Bill and Melinda Gates Foundation. The series, and this volume, have brought the world's leading policy experts in the fields of food and agricultural development together for a comprehensive dialogue on pro-poor growth and food security policy. Participants and contributing authors have addressed the major themes of hunger and rural poverty, agricultural productivity, resource and climate constraints on agriculture, and food and agriculture policy, with a focus on sub-Saharan Africa.

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Rosamond L. Naylor
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Stanford experts from a range of disciplines will discuss the interconnections and interactions among humanity’s need for and use of energy, food, water, and environmental resources. Drawing on their own research, each speaker will illustrate and evaluate some of the ways in which decisions in one resource area can lead to trade-offs or co-benefits in other areas. Stanford students and faculty will lead interactive breakout sessions to explore a range of challenges associated with energy transitioning to a sustainable system.

Featured videos:

Energy and Food Nexus: David Lobell, Assistant Professor of Environmental Earth System Science

Plenary Discussion: The Way Forward
  • Moderated by Margot Gerritsen, Associate Professor of Energy Resources Engineering; Director, Institute for Computational and Mathematical Engineering 
  • Donald Kennedy, President, Emeritus, Stanford University; Bing Professor of Environmental Science, Emeritus
  • Rosamond Naylor, Professor of Environmental Earth System Science; Director, Center on Food Security and the Environment
  • Adam Brandt, Assistant Professor of Energy Resources Engineering


 

Video link to additional Stanford faculty talks

Introduction: Energy System Overview by Roland Horne, Professor of Energy Resources Engineering

Overview of Natural Gas Issues: Mark Zoback, Professor of Geophysics

Energy and Environment Nexus: Stefan Reichelstein, Professor in the Graduate School of Business

Energy and Water Nexus: Richard Luthy, Professor of Civil and Environmental Engineering; Director of ReNUWIt

Energy and Climate Change Nexus: Michael Wara, Associate Professor of Law

Breakout Sessions

Led by postdoc/graduate students, breakout sessions will actively engage the participant on provocative and real world energy topics such as: 

  • Boon or Bust? Fracking’s Socioeconomic Costs and Benefits
  • Keystone XL: Band Guy or Fall Guy?
  • Wind Energy and Wildlife Conservation: Green vs. Green?
  • Are you Aware of Your Habits? Tweaking Our Routines to Conserve
  • Is America Neglecting America?  The Forgotten Frontier of the Alaskan Arctic
  • Is Water scarcity a Threat to the World’s Energy Future?

Frances C. Arrillaga Alumni Center

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Encina Hall E401
Stanford, CA 94305

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1931 - 2020
President Emeritus of Stanford University
Bing Professor of Environmental Science and Policy, Emeritus
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Donald Kennedy is the editor-in-chief of Science, the journal of the American Association for the Advancement of Science, and a CESP senior fellow by courtesy. His present research program entails policy on such trans-boundary environmental problems as: major land-use changes; economically-driven alterations in agricultural practice; global climate change; and the development of regulatory policies.

Kennedy has served on the faculty of Stanford University from 1960 to the present. From 1980 to 1992 he served as President of Stanford University. He was Commissioner of the US Food and Drug Administration from 1977-79. Previously at Stanford, he was as director of the Program in Human Biology from 1973-1977 and chair of the Department of Biology from 1964-1972.

Kennedy is a member of the National Academy of Sciences, the American Academy of Arts and Sciences, and the American Philosophical Society. He served on the National Commission for Public Service and the Carnegie Commission on Science, Technology and Government, and as a founding director of the Health Effects Institute. He currently serves as a director of the Carnegie Endowment for International Peace, and as co-chair of the National Academies' Project on Science, Technology and Law. Kennedy received AB and PhD degrees in biology from Harvard University.

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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
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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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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
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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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Soybean production has become a significant force for economic development in Brazil. It has also received considerable attention from environmental and social non-governmental organizations as a driver of deforestation and land consolidation. While many researchers have examined the impacts of soybean production on human and environmental landscapes, there has been little investigation into the economic and institutional context of Brazilian soybean production or the relationship between soy yields and planted area. This study examines the influence of land tenure, land use policy, cooperatives, and credit access on soy production in Brazil. Using county level data we provide statistical evidence that soy planted area and yields are higher in regions where cooperative membership and credit levels are high, and cheap credit sources are more accessible. This result suggests that soybean production and profitability will increase as supply chain infrastructure improves in the Cerrado and Amazon biomes in Brazil. The yields of competing land uses, wheat, coffee, and cattle production and a complementary use, corn production, also help to determine the location of soybean planted area in Brazil. We do not find a significant relationship between land tenure and planted area or land tenure and yields. Soy yields decline as transportation costs increase, but planted area as a proportion of arable land is highest in some of the areas with very high transportation costs. In particular, counties located within Mato Grosso and counties within the Amazon biome have a larger proportion of their arable, legally available land planted in soy than counties outside of the biome. Finally, we provide evidence that soy yields are positively associated with planted area, implying that policies intending to spare land through yield improvements could actually lead to land expansion in the absence of strong land use regulations. While this study focuses on Brazil, the results underscore the importance of understanding how supply chains influence land use associated with cash crops in other countries.

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Rachael Garrett
Eric Lambin
Rosamond L. Naylor
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This study quantifies worldwide health effects of the Fukushima Daiichi nuclear accident on 11 March 2011. Effects are quantified with a 3-D global atmospheric model driven by emission estimates and evaluated against daily worldwide Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) measurements and observed deposition rates. Inhalation exposure, ground-level external exposure, and atmospheric external exposure pathways of radioactive iodine-131, cesium-137, and cesium-134 released from Fukushima are accounted for using a linear no-threshold (LNT) model of human exposure. Exposure due to ingestion of contaminated food and water is estimated by extrapolation. We estimate an additional 130 (15–1100) cancer-related mortalities and 180 (24–1800) cancer-related morbidities incorporating uncertainties associated with the exposure–dose and dose–response models used in the study. Sensitivities to emission rates, gas to particulate I-131 partitioning, and the mandatory evacuation radius around the plant may increase upper bound mortalities and morbidities to 1300 and 2500, respectively. Radiation exposure to workers at the plant is projected to result in 2 to 12 morbidities. An additional 600 mortalities have been reported due to mandatory evacuations. A hypothetical accident at the Diablo Canyon Power Plant in California, USA with identical emissions to Fukushima may cause 25% more mortalities than Fukushima despite California having one fourth the local population density, due to differing meteorological conditions.


Mark Z. Jacobson is Director of the Atmosphere/Energy Program and Professor of Civil and Environmental Engineering at Stanford University. He is also a Senior Fellow of the Woods Institute for the Environment and Senior Fellow of the Precourt Institute for Energy. He received a B.S. in Civil Engineering with distinction, an A.B. in Economics with distinction, and an M.S. in Environmental Engineering from Stanford University, in 1988. He received an M.S. in Atmospheric Sciences in 1991 and a PhD in Atmospheric Sciences in 1994 from UCLA. He has been on the faculty at Stanford since 1994. His work relates to the development and application of numerical models to understand better the effects of energy systems and vehicles on climate and air pollution and the analysis of renewable energy resources. He has published two textbooks of two editions each and ~130 peer-reviewed scientific journal articles. He received the 2005 American Meteorological Society Henry G. Houghton Award for “significant contributions to modeling aerosol chemistry and to understanding the role of soot and other carbon particles on climate.” He has served on the Energy Efficiency and Renewables Advisory Committee to the U.S. Secretary of Energy.

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