International Development

FSI researchers consider international development from a variety of angles. They analyze ideas such as how public action and good governance are cornerstones of economic prosperity in Mexico and how investments in high school education will improve China’s economy.

They are looking at novel technological interventions to improve rural livelihoods, like the development implications of solar power-generated crop growing in Northern Benin.

FSI academics also assess which political processes yield better access to public services, particularly in developing countries. With a focus on health care, researchers have studied the political incentives to embrace UNICEF’s child survival efforts and how a well-run anti-alcohol policy in Russia affected mortality rates.

FSI’s work on international development also includes training the next generation of leaders through pre- and post-doctoral fellowships as well as the Draper Hills Summer Fellows Program.

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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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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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Walter P. Falcon
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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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Promotion of smallholder irrigation is cited as a strategy for enhancing income generation and food security for sub-Saharan Africa’s poor farmers, but what makes this technology a successful poverty alleviation tool? In the short run, the technology should pave the way for increased consumption, asset accumulation, and reduced persistent poverty among users. Over the longer run, it should lead to institutional feedbacks that support sustained economic development and nutritional improvements. Our conceptual model and review of case studies reveal the importance of three sub-components of irrigation technology—access, distribution, and use—and the ways in which the design of the technology itself can either bridge, or succumb to, institutional gaps. These critical features are illustrated in an experimental evaluation of a solar-powered drip irrigation project in rural northern Benin, which provides a controlled study of technology impacts in the Sudano-Sahel. The combined evidence highlights the technical and institutional requirements for project success and points to two important areas of research in the scale-up of any small-scale irrigation strategy: the risk behavior of water users, and the evolution of institutions that either support or obstruct project replication over space and time.

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Jeff Raikes, CEO of the Bill & Melinda Gates Foundation, set the tone for a daylong conference on Nov. 10 that explored the causes of global poverty and how researchers, governments and philanthropists can lift the world’s most vulnerable from chronic underdevelopment. 

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Part 1: Jeff Raikes, CEO, the Bill & Melinda Gates Foundation, discusses the connections among health, economic development and political stability. 
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Part 2: Stanford’s Mariano-Florentino Cuéllar leads a panel on “Food, Security and Global Politics in the 21st Century.”  
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Part 3: Kofi Annan, former secretary-general of the United Nations, discusses the global challenges of food security. 
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Part 4: Stanford’s Rosamond Naylor moderates a conversation about “Food Security and the Control of Infectious Disease.” 
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Part 5: Stanford’s Grant Miller joins panelists discussing vaccines and their role in world security.
 
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This past Thursday, on the 10th of November 2011, former U.N. Secretary-General, Kofi Annan delivered a speech at Stanford University on the occasion of the launch of the Freeman Spogli Institute for International Studies' Center on Food Security and the Environment. Citing UN estimates, more precisely the UNFPA State of the World Population 2011 report, he highlighted that the world population had recently reached seven billion and growing. Advancements in healthcare and technology have increased our life expectancy, affording 'man' the ability to escape a life that is, in Hobbesian parlance, "poor, nasty, brutish, and short." Yet this apparent human success story eclipses the "shameful failure" of the international community to address an indiscernible fact: that in the contemporary technological age, an astonishing number of people in the world go hungry each day. The marriage of a globalized economy and scientific innovation was supposed to - at least in theory - increase and spread wealth and resources to enhance the human condition. And yet today - talks of unfettered markets and the financial crisis aside -, we lay witness to close to one billion people around the world who lack food security (both chronic and transitory). Citing numbers from the World Bank, Annan stated that rapidly rising food prices since 2010 have "pushed an additional 70 million people into extreme poverty". Adding to these disturbing figures is the fact that one of the world's most ravenous culprits of infanticide is no other than hunger, which claims the young lives of 17,000 children every day.

Dwindling incentives to farm and increasing pressures on farmers are not helping the food insecurity crisis. Frequently, companies who contract local farmers to produce cash crops for export do not employ "strategic agricultural planning" or take into account the impact their policies and modus operandi may have on local farming communities and their immediate (food) needs. Artificially low prices for agricultural goods force farmers from their land and discourage investment in the sector, Annan warns. Agricultural subsidies in the US and Europe against farm produce injected into the market by farmers from developing countries have also added to the problem. Agricultural subsidies in Europe in particular have had a devastating impact on farmers from other parts of the world - mostly in Asia and Africa - who simply cannot compete with the existing market conditions and the low price tags attached to their goods. This phenomenon is most acute in Africa where a significant segment of the population lives modestly by working the land and these subsidies are choking the lifeline that feeds their families. To bring home the point of the sheer imbalance between the conditions of Western farmers and the 'rest', Annan stated that with a fraction of the funds generated by a reduction of subsidies, one "can fly every European cow around the world first class and still have money left over". Without a more balanced approach to international trade policy making, subsidies will continue to be a factor in food insecurity.

And it gets worse. The 'Four Horsemen of the Apocalypse' of our times - (i) an ever emerging global water crisis, (ii) land misuse and degradation, (iii) climate change, and (iv) kleptocratic governance - have combined to aggravate an already dire international food insecurity predicament. The hard truth is that without countering the forward gallop of these ills, food insecurity cannot be adequately addressed.

The facts on the ground and projections into the future do not paint a promising picture. Food prices are expected to rise by 50 percent by the year 2050, Annan warns, and this at a time when the world will be home to two billion more inhabitants. In 40 years from now, there simply isn't enough food to nourish and satisfy the world's population.

The growing world food crisis also stifles development. It is the cyclical brutality of poverty that keeps the hungry down. Without the means or access to proper and adequate nutrition, the impoverished who are always the first victims of food insecurity invariably suffer from poor health, in turn resulting in low productivity. This vicious cycle traps the less privileged to a seemingly inescapable downward spiral.

During the course of his poignant remarks, Annan stated that without addressing food insecurity "the result will be mass migration, growing food shortages, loss of social cohesion and even political instability". He is correct on all counts.

The fact is that a world which 'cultivates' and then neglects the hungry is a dangerous and volatile world. Since time immemorial, dramatic human migrations have had a direct correlation with changes in climate, habitat and resource scarcity. Survival instincts are engrained in our genetic make-up. When the most basic and fundamental necessities of life are sparse and hard to come by, our natural inclination is to look for 'greener pastures'. An unaddressed and lingering food insecurity crisis will mean the world will witness significant and rapid migration trends in the 21st century (a phenomenon very much in motion today). The injection of mass flows of people into other foreign populations will cause friction and conflict induced by integration challenges, both social and economic (surmountable, but conflicts no less).

Moreover, the desperation and unmet basic needs of the underprivileged can translate into open outbursts of conflict and violence. Tranquility and social harmony are virtues enjoyed by countries that can provide for their people. Leaving the growing food insecurity dilemma unaddressed will be to invite inevitable political instability and violence in countries and fragile regions of the world grappling with high poverty rates and concomitant food insecurity challenges. More often than not, history has shown a positive nexus between hunger and social upheaval (it bears noting that La Grande Révolution of 1789-99 was preceded by slogans of "Du pain, du pain!"). Further, it does not take too much of a forethought to recognize that it is precisely in environments of destitute and despondency where autocratic rule can easily take root and grow to inflict further suffering.

Food insecurity can also lead to wars, but similarly wars contribute to food insecurity by destroying both the land and the ability to cultivate the land. Conflict represents formidable barriers to the access and availability of otherwise usable land (countries like Somalia, Sudan, Burundi, Ethiopia and Liberia come to mind).

To be sure, "[w]ithout food, people have only three options: they riot, they emigrate or they die" (borrowed from the often cited words of Josette Sheeran, the Executive Director of the UN World Food Program).

How are we to tackle this grave problem in a realistic and effective manner? Annan rightly tells us that the "[l]ack of a collective vision is irresponsible". Implicit in Annan's remarks is also a lack of leadership to effectively tackle and untie the Gordian Knot of food insecurity. The nature and colossal character of food insecurity demands action and cooperation on a global scale. Climate change and its negative impact on the environment - e.g. diminishing arable lands, water resources, recurring drought -, one of the accelerators of food insecurity, requires robust and committed international agreement and action to reduce the emission of greenhouse gases. Strict adherence and compliance with the Kyoto Protocol and the Copenhagen Accord are a must in this regard. With strategic agricultural planning, knowledge transfer and investment, uncultivated arable lands - abundant in many parts of the world, including in Africa - can become productive and bear fruit, reducing in turn the hunger crisis. Efforts to implement more balanced international trade policies which make farming viable across continents as well as efforts to eradicate corruption (by promoting good governance) are also part and parcel of the fight against hunger. So are innovative ways of thinking about establishing, say rapid response mechanisms to preempt and effectively counter famine and other food emergencies by bolstering the capacities of relevant existing international and regional organizations. We could also reduce the threat of hunger by doing more than just pay lip-serve to the UN Millennium Development Goals (MDGs) and uphold our commitments to the MDGs through sustained funding and support.

The UN and other multilateral bodies and pacts are tools we have created to work collaboratively - as best as human frailties permit - to confront global challenges and ills that threaten the social fabric of human society (whether they be food insecurity, dearth in development, war and the crimes that emanate from aggression which threaten peace and security, inter alia). Our capacity to reason, innovate, communicate and cooperate is hence an indispensible tool in our struggle to keep the peace, to protect our fundamental human rights and to satisfy our most basic needs for survival. It's time to put these faculties to work in confronting the world's food security challenges.

It is only fitting to conclude these brief remarks by quoting from the man and the lecture that inspired them. "If we pool our efforts and resources we can finally break the back of this problem", stated Annan in his call for action to defeat food insecurity. If there's a will, history tells us, change is within grasp, no matter how daunting the task. It only takes the trinity of courage, commitment and leadership.

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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.
Ben Chrisman
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Despite an increase in food production and incomes worldwide, one in seven of the world’s 7 billion people is hungry.

Upheavals in food prices and the global economy, combined with a growing population’s demands for food and energy, are widening the gap between rich and poor. And that rift is creating new challenges to feed the hungry – most of whom live in remote, rural areas – without depleting the planet’s natural resources.

Stanford’s Center on Food Security and the Environment (FSE) is dedicated to addressing these challenges. Started as a research program in 2006, FSE is celebrating its launch today as a full-scale research center. The celebration is part of a larger conference hosted by the Freeman Spogli Institute for International Studies (FSI) focused on links between international security, food and health care. The institutional elevation signifies the growing importance of food security issues at Stanford and worldwide. And it positions FSE to become the leading academic institution in the field of food security.

“Food security has quickly risen as a critical global issue comparable to international security, global health, and democratization, and will remain a pressing issue in the years head,” said Rosamond L. Naylor, director of FSE. “We’re looking at how to raise people out of poverty so they can afford more food, how to stabilize prices so food isn’t too expensive, and how to grow more food without destroying the environment.”

In an introduction given at FSE’s Global Food Policy and Food Security Symposium Series last winter, Stanford President John Hennessy remarked, “Stanford was founded on the idea that its teaching and research could have a broader impact on society, and the area of food security certainly has that kind of possibility.”

“Our work on hunger, rural poverty, and the environmental impact of food production is critical not only to the future of our lives here in the United States but to the lives of people around the world,” said Hennessey. “We will need to bring together teams of experts from different disciplines if we are going to make important contributions to this work.”

FSE’s dual affiliation with the Freeman Spogli Institute for International Studies and the Woods Institute for the Environment supports these collaborations, and is a key factor to the center’s expansion. The center is led by Naylor and its deputy director, Walter P. Falcon. Both share a long history at Stanford studying international agricultural economics.

Naylor received her PhD from Stanford’s Food Research Institute in 1989, and is now a professor in the department of Environmental Earth System Science. Her interdisciplinary approach to teaching has resulted in popular courses such as the World Food Economy (which she co-teaches with Falcon,) and Human Society and Environmental Change. Naylor was appointed the William Wrigley Senior Fellowship in 2008 in recognition of her multidisciplinary, cutting-edge research and long-term commitment to combating global hunger and environmental degradation.

Falcon, the Helen Farnsworth Professor of Agricultural Policy, Emeritus, served as the director of Stanford’s Food Research Institute from 1972 to 1991. Falcon’s leadership role continued as FSI’s director from 1991 to 1998. Between 1998 and 2007, he co-directed the Center for Environmental Science and Policy out of which grew the Program on Food Security and the Environment.

FSE is now engaged in over 15 major projects with $11.5 million in grant and program funding under management. Productive food systems and their environmental consequences comprise the core of the Center’s research portfolio.

“Roz Naylor and Wally Falcon have worked tirelessly to promote the center’s mission and to secure the funding needed to support the center’s growth,” said FSI Director Coit D. Blacker. “It is gratifying to see FSE’s research and scholarly agendas receiving a resounding vote of confidence from the University as well as some of the world’s leading foundations, agencies and individual donors.” 

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President of women's farming group in Dunkassa, Benin shares carrots from her garden grown with the help of a solar-powered irrigation system.
Jennifer Burney
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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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