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Rural farmers in sub-Saharan Africa live under risky conditions. Many grow low-value cereal crops that depend on a short rainy season, a practice that traps them in poverty and hunger.

But reliable access to water could change the farmers' perilous situation. Stanford scientists are calling for investments in small-scale irrigation projects and hydrologic mapping to help buffer the growers from the erratic weather and poor crop yields that are expected to worsen with climate change in the region.

The potential for increased irrigation is there, said Jennifer Burneya fellow at Stanford's Center on Food Security and Environment at the Freeman Spogli Institute for International Studies.

Burney's team partnered with the Solar Electric Light Fund (SELF) to measure economic and nutritional impacts of solar-powered drip-irrigated gardens on villages in West Africa's Sudano-Sahel region. Burney will present the group's work on small-scale irrigation Wednesday, Dec. 7, at the fall meeting of the American Geophysical Union in San Francisco.

"Irrigation is really appealing in that it lets you do a lot of things to break this cycle of low productivity that leads to low income and malnutrition," said Burney.

Modern irrigation often means multi-billion-dollar projects like damming rivers and building canals. But Burney says that these projects have not reached sub-Saharan Africa because countries lack the capital and ability to carry out big infrastructure projects.

A different approach, gaining popularity in sub-Saharan Africa, involves cooperation. Individuals or groups, called smallholders, organize to farm small plots and ensure their access to irrigation. These projects allow farmers to grow during the dry season and produce profitable, high-nutrition crops like fruits and vegetables in addition to the cereal crops they already grow.

Still, only 4 percent of cropland in sub-Saharan Africa is irrigated.

Smallholder irrigation

Burney and her colleagues' work in two northern Benin villages is an example of successful investment in smallholder irrigation. They worked with women's cooperative agricultural groups to install three solar-powered drip irrigation systems. Drip irrigation conserves water by delivering it directly to the base of plants. The technique also reduces fertilizer runoff.

The team surveyed 30 households in each village and found that solar drip irrigation increased standards of living and increased vegetable consumption to the U.S. Department of Agriculture's recommended daily allowance. By selling the vegetables, households were able to purchase staples and meat during the dry season.

Successful smallholder irrigation projects have high investment returns, said Burney. Her team has seen real success from irrigation projects – like those in Benin – that provide enough returns for women to send kids to school or buy small business equipment like a sewing machine or market stall.

"That's when I think it really becomes a ladder out of poverty," Burney said.

Lessons for success

For solar technology projects to be successful, Burney said, just dropping in and giving people irrigation kits doesn't work. Communities need access to a water source and need to see the benefits of a project.

"You need the technology and management and the water access, all together," said Burney. "Our solar project incorporates all of that."

According to Burney, smallholders need not limit themselves to solar irrigation systems. "Solar is great if you have an unreliable fuel," she said. "But if you're someplace that's connected to the grid, an electrical pump would more economical."

"There are a lot of different solutions that involve many different kinds of water harvesting," Burney said. "Groundwater, rainwater, surface water, and there are a lot of places in the Sahel, like Niger, for example, where there are artesian wells." The Sahel is a transition zone between the Sahara Desert and the savannas further south.

Given the diversity of water resources in West Africa, Burney suggests that nongovernmental organizations and governments prioritize detailed hydrologic mapping in the region. Otherwise, the cost of geophysical surveys and finding water sources, especially unseen groundwater, could become an insurmountable barrier for farm communities.

"It needs to be really detailed, comprehensive, usable information that's out there for everybody to be able to take advantage of," she said.

Burney says that both of the benefits that farmers get from irrigation systems –growing outside of the rainy season and producing more diverse, profitable crops – are important for adapting to climate change.

"You can produce more value on less land in most cases and not be as beholden to the whims of the rainy season," she said. Having more disposable income also will reduce vulnerability to hunger and malnutrition. "Economic development can be a form of adaptation," she said.

Rosamond L. Naylor, director of Stanford's Center on Food Security and the Environment, and Sandra Postel of the Global Water Policy Project were collaborators on the project.

Sarah Jane Keller is a science-writing intern at the Stanford News Service.


 

Jennifer Burney is scheduled to speak at the fall meeting of the AGU in San Francisco on Dec. 7 in Room 2008 (Moscone West), in Session B32B, Feeding the World While Sustaining the Planet: Building Sustainable Agriculture Within the Earth System II, which runs from 10:20 a.m. to 12:20 p.m. Her talk, "Smallholder Irrigation and Crop Diversification Under Climate Change in Sub-Saharan Africa: Evidence and Potential for Simultaneous Food Security, Adaptation and Mitigation," is scheduled from 12:04 to 12:17 p.m.

 

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Climate change will lead to massive conflicts, according to claims of such prominent sources as Sir Nicholas Stern and the US National Security Agency - claims repeated by the media. Efforts to tease a specific climate change signal from historical records of civil conflict have proved inconclusive, however: they postulate that farmers will become fighters when resources become critically scarce; but they have been unable to illuminate what specific mechanisms may be involved. Yet the potential for climate change to cause significant civil conflict seems intuitively obvious, and the need for better understanding remains urgent. My research focuses on sub-Saharan Africa, the most conflict-prone region in the world; and it asks what factors make some countries erupt in civil conflict, while others do not. I find that drops in agricultural exports diminish government capacity as tax revenues shrink, leading to an increase in the risk of civil conflict. Thus, government capacity to provide security and services is likely to become weak just at the time when climate change is increasing the need for both. How governments respond will determine the risk of civil conflict, but this research shows that their capacity to respond will, in fact, also be affected. The implications of these conclusions apply beyond sub-Saharan Africa, and begin to move the debate from questions around if climate change will cause conflict to more productive discussions of how climate change may affect conflict risk.

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Seeds of Sustainability is a groundbreaking analysis of agricultural development and transitions toward more sustainable management in one region. An invaluable resource for researchers, policymakers, and students alike, it examines new approaches to make agricultural landscapes healthier for both the environment and people.

The Yaqui Valley is the birthplace of the Green Revolution and one of the most intensive agricultural regions of the world, using irrigation, fertilizers, and other technologies to produce some of the highest yields of wheat anywhere. It also faces resource limitations, threats to human health, and rapidly changing economic conditions. In short, the Yaqui Valley represents the challenge of modern agriculture: how to maintain livelihoods and increase food production while protecting the environment.

Renowned scientist Pamela Matson and colleagues from leading institutions in the U.S. and Mexico spent fifteen years in the Yaqui Valley in Sonora, Mexico addressing this challenge. Seeds of Sustainability represents the culmination of their research, providing unparalleled information about the causes and consequences of current agricultural methods. Even more importantly, it shows how knowledge can translate into better practices, not just in the Yaqui Valley, but throughout the world.

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Stanford’s Center on Food Security and the Environment (FSE) has received a $2 million grant from Cargill, a second gift from the company that raises its total contribution to FSE to $5 million over 10 years.

The announcement was made Nov. 10 at a dinner celebrating the launch of FSE as a full-scale research center. FSE has more than doubled in size in five years. Because of its growth and increasing importance of food security issues at Stanford and worldwide, it became an official center in September.

“The center’s rapid growth would not have been possible without the generous support of Cargill,” FSE Director and William Wrigley Senior Fellow Rosamond L. Naylor said. “Cargill’s initial investment provided seed-funding for the bold, new research and teaching that was happening at FSE while keeping our lights on and the staff running during our critical years of early development.”

A $3 million grant from Cargill in 2008 jump-started a visiting fellows program at FSE and helped build the infrastructure to support the center’s research.

The new grant will continue to provide program support, but will also be used to hire younger faculty and scholars to Stanford to work within the new Center.

Stanford-Cargill partnership

Stanford's partnership with Cargill extends back to 1976 when Cargill endowed Walter P. Falcon, then Director of Stanford's Food Research Institute and now FSE Deputy Director, with the Helen C. Farnsworth Professorship in International Agricultural Policy. The gift was intended to strengthen Stanford's work in agricultural policy, specifically as it relates to the international grain economy. FSI senior fellow Scott Rozelle now holds the Helen C. Farnsworth chair.

FSE and Cargill remain committed to helping feed a growing population while preserving the planet's natural resources. FSE is an applied group focused on providing real solutions to important food and agricultural issues.

“Poverty is the main issue driving food insecurity—it’s a question of access rather than food availability,” Naylor said.

FSE’s partnership with Cargill has demonstrated how Stanford-based research can be relevant to the private sector. FSE is conducting ongoing research on oil palm and land use issues in Indonesia that is helping inform and shape policy. Work on aquaculture feeds in China is another overlapping area of interest, as are ongoing assessments of biofuels in the U.S., Africa and Asia. Both have a stake in better understanding climate change impacts on agriculture and food commodity price volatility.

“It is clear to us at FSE—and increasingly to leadership of Stanford—that global food security will remain a critical issue within international policy circles,” said Naylor. “With support like the grant from Cargill, we are confident that Stanford can play a leading role in shaping the future policy discourse.”

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Blaming leaders in America and abroad for not doing enough to combat climate change, former United Nations Secretary-General Kofi Annan said continued failure to tackle the problem will result in worldwide hunger, social unrest and political turmoil.

“Without action at the global level to address climate change, we will see farmers across Africa – and in many other parts of the world including here in America – forced to leave their land,” the 2001 Nobel Peace Prize winner told a crowd of about 1,400 people at Stanford’s Memorial Auditorium on Thursday. “The result will be mass migration, growing food shortages, loss of social cohesion and even political instability.”

Citing numbers from the World Bank, Annan said rapidly rising food prices since 2010 have “pushed an additional 70 million people into extreme poverty.” He called a lack of food security for nearly 1 billion of the world’s population “an unconscionable moral failing” that is also a stumbling block to a strong international economy.

“It affects everything from the health of an unborn child to economic growth,” he said.

Annan’s talk, “Food Security Is a Global Challenge,” was delivered as part of a daylong conference on global underdevelopment sponsored by Stanford’s Freeman Spogli Institute for International Studies. The event drew the world’s leading experts in the field and featured panel discussions that explored the connections between global security and food supplies, health care and governance. Keynote speeches were delivered by Annan and Jeff Raikes, CEO of the Bill & Melinda Gates Foundation. Former Secretary of Defense Robert Gates also planned to deliver a talk to a private audience.

The conference marked the launch of FSI’s Center on Food Security and the Environment.

“With this facility, and the creative thinkers and inquisitive minds for which Stanford is famous, you are well-equipped to undertake research which advances our knowledge and helps to shape our response to the many global challenges we face,” Annan said. “And with the resources at your disposal, you also have the capacity to actively engage to influence policy, implement solutions and thus improve the lives of the most vulnerable people on the planet.”

Annan also lauded government initiatives such as America’s Feed the Future program that focus on alleviating global hunger. He recently met with Secretary of State Hillary Clinton, Secretary of Agriculture Tom Vilsack and Raj Shah, head of the U.S. Agency for International Development, to discuss ways to address food insecurity.

“If we pool our efforts and resources, we can finally break the back of this problem,” he said.

But he challenged wealthier nations to do more than pay lip service to the problem.

“We need to make sure that promises of extra support from richer countries are kept and involve fresh funds rather than the repackaging of existing financial commitments,” he said.

Annan, who is the chair of the Kofi Annan Foundation, the Africa Progress Panel, and the Alliance for a Green Revolution in Africa, said Africa represents both the greatest problem and the greatest promise when it comes to food security.

The continent is home to 60 percent of the world’s uncultivated arable land, but cannot produce enough food to feed its own people, he said. But if Africa can grow just half the world’s average yield of staple crops like wheat, corn and rice, it would end up with a food surplus.

Transforming Africa into one of the world’s biggest crop producers will take more than supporting farmers, he said. It entails sound environmental stewardship.

 “I hope this is an area where the Center on Food Security and the Environment can make a major contribution to finding solutions,” Annan said.

Without those solutions, the future is bleak.

In Sub-Saharan Africa, where global warming brings the threat of persistent drought, current crop production is expected to be cut in half by the end of the century and 8 percent of the region’s fertile land is expected to dry up.

“Those arguing, here and elsewhere, for urgent action and a focus on opportunities to green our economies still find themselves drowned out by those with short-term and vested interests,” Annan said. “This lack of long-term collective vision and leadership is inexcusable. It has global repercussions, and it will be those least responsible for climate change – the poorest and most vulnerable – that will pay the highest price.”

Annan's speech was sponsored by FSI, Stanford in Government and the Stanford University Speakers Bureau.

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Former U.N. Secretary-General Kofi Annan delivers a keynote address on food security and climate change during FSI's global underdevelopment conference on Nov. 10, 2011.
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Over much of the world, the growing season of 2050 will probably be warmer than the hottest of recent years, with more variable rainfall. If we continue to grow the same crops in the same way, climate change will contribute to yield declines in many places. With potentially less food to feed more people, we have no choice but to adapt agriculture to the new conditions.

To some extent, adaptation can be done by moving crops to more favourable areas and by agronomic tweaks. But that will almost certainly not be enough. We will have to give crops a genetic helping hand, infusing them with new genes to allow them to better cope with new climates, and the new pests and diseases they will bring. Where are these genes going to come from?

Some of them could come from completely unrelated organisms, to be spliced into their new genomic homes using advanced biotechnologies. However, there is significant public resistance to that strategy, and it is still unclear how effective genetically modified crops are at coping with heat and drought. We cannot risk putting all our eggs in that basket.

Another source of genes for crop improvement are traditional heirloom varieties, often called landraces, which are still grown by subsistence farmers in many parts of the world, although they are fast disappearing. Large collections of their seeds have been made over the years, creating genebanks that are scoured by plant breeders searching for crop diversity, and which helped spur the Green Revolution in agriculture from the late 1960s.

But there’s a limit to the diversity found in domesticated species, imposed by domestication itself. Cultivated species usually contain a fraction of the genetic diversity found in their closest wild relatives — a legacy of the ‘domestication bottleneck’. Ancient farmers selected relatively few plants from the progenitors of modern crops, in a limited number of places. Although there has been continuous gene flow between crops and their wild relatives where they coexist, a lot of genetic diversity has been lost as agriculture has developed.

We know that the ‘lost’ genetic diversity includes genes for resistance to high temperatures and drought, and to pests and diseases, as well as taste and nutritional composition, and even yield. If there was ever a time to go back and reclaim this diversity, that time is now. In fact, it is already being used more than many people realize. For instance, there is probably no widely grown rice cultivar that does not have some genes obtained by breeders from its wild relatives. But we could be making much more effective, and systematic, use of the reservoir of diversity our Neolithic ancestors left behind.

To read the full commentary, click here.

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Feeding a growing population in a hotter world will require exploiting a far broader range of crop diversity than now — and that means valuing wild genes.

Over much of the world, the growing season of 2050 will probably be warmer than the hottest of recent years, with more variable rainfall. If we continue to grow the same crops in the same way, climate change will contribute to yield declines in many places. With potentially less food to feed more people, we have no choice but to adapt agriculture to the new conditions.

To some extent, adaptation can be done by moving crops to more favourable areas and by agronomic tweaks. But that will almost certainly not be enough. We will have to give crops a genetic helping hand, infusing them with new genes to allow them to better cope with new climates, and the new pests and diseases they will bring. Where are these genes going to come from?

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Richard and Rhoda Goldman Professor of Environmental Studies, Senior Fellow at the Woods Institute for the Environment, FSE Affiliated Faculty
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Pamela Matson is an interdisciplinary sustainability scientist, academic leader, and organizational strategist. She served as dean of Stanford University’s School of Earth, Energy and Environmental Sciences from 2002-2017, building interdisciplinary departments and educational programs focused on resources, environment and sustainability, as well as co-leading university-wide interdisciplinary initiatives. In her current role as the Goldman Professor of Environmental Studies and Senior Fellow in the Woods Institute for the Environment, she leads the graduate program on Sustainability Science and Practice. Her research addresses a range of environment and sustainability issues, including sustainability of agricultural systems, vulnerability and resilience of particular people and places to climate change, and characteristics of science that can contribute to sustainability transitions at scale.

Dr. Matson serves as chair of the board of the World Wildlife Fund-US and as a board member of the World Wildlife Fund-International and several university advisory boards. She served on the US National Academy of Science Board on Sustainable Development and co-wrote the National Research Council’s volume Our Common Journey: A transition toward sustainability (1999); she also led the NRC committee on America’s Climate Choices: Advancing the Science of Climate Change. She was the founding chair of the National Academies Roundtable on Science and Technology for Sustainability, and founding editor for the Annual Review of Environment and Resources. She is a past President of the Ecological Society of America. Her recent publications (among around 200) include Seeds of Sustainability: Lessons from the Birthplace of the Green Revolution (2012) and Pursuing Sustainability (2016).

Pam is an elected member of the National Academy of Science and the American Academy of Arts and Sciences, and is a AAAS Fellow. She received a MacArthur Foundation Award, contributed to the award of the Nobel Prize to the Intergovernmental Panel on Climate Change, among other awards and recognitions, and is an Einstein Fellow of the Chinese Academy of Sciences.

Dr. Matson holds a Bachelor of Science degree with double majors in Biology and Literature from the University of Wisconsin (Eau Claire), a Master degree in Environmental Science and Policy from Indiana University’s School of Public and Environmental Affairs, a Doctorate in Forest Ecology from Oregon State University, and honorary doctorates from Princeton, McGill and Arizona State Universities. She spent ten years as a research scientist with NASA-Ames Research Center before moving to a professorship at the University of California Berkeley and, in 1997, to Stanford University.

Introduction to the Problem: Agricultural productivity is highly dependent on climate variability and is thus susceptible to future changes including temperature extremes and drought. The latter is expected to increase in frequency regionally over this century.

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