How to Feed The World: Start Small
When American families sit down to dinner, often the concern is to avoid eating too much. Yet in 2010, the United Nations' Food and Agriculture Organization (FAO) estimated that more than 900 million people around the world were undernourished. By 2050, the world's population is projected to rise to somewhere around 9 billion — and more people will likely be eating more meat, which takes more resources and energy to produce than most crops.
How on earth will our agricultural systems feed all those mouths, especially while coping with climate change, soil degradation and erosion, water shortages, and rising energy prices? And can it be done without increasing the environmental damage attributed to industrial farming practices?
Maybe, if we can learn to see landscapes through the eyes of a bee. That may seem a tall order for such a tiny insect, but Claire Kremen believes that understanding what is good for bees is a first step toward shaping agricultural ecosystems, or "agroecosystems," that can sustain both humans and natural biodiversity, without the need for the huge inputs of chemicals and energy that have made industrial farming practices so damaging.
Kremen, a conservation biologist and associate professor in the Department of Environmental Science, Policy, and Management (ESPM), was studying the effects of natural habitat on the crop pollination services of wild bees when she made an observation that would alter the focus of her research. The farms in her study that were more biodiverse, growing multiple crops with organic techniques, interspersed with natural habitat, seemed able to "grow their own bees," providing sufficient food and nesting resources to act as oases for wild pollinators in the midst of otherwise intensively farmed landscapes. These farms could rely to a large degree on wild bees to pollinate their crops, while farms growing only one crop had to import European honeybees for pollination.
This discovery put Kremen on the road to realizing that most or even all of the inputs that modern commercial farms require — chemical pesticides and fertilizers, wasteful amounts of water and energy, imported pollinators — were needed only because the monoculture-dominated landscapes created by industrial agriculture lacked biodiversity.
"From studying the pollinators, I realized that the way we conduct agriculture has basically required us to replace all of the ecosystem services that used to be in the agricultural ecosystem with substitutes," she says. If farmers could bring back many of the traditional practices that supported biodiversity, enhanced by the application of modern ecological science, Kremen believes that the world could produce more food while reducing agriculture's harmful effects, making it more sustainable over the long term. A growing number of policy-makers and researchers are thinking along the same lines. A 2008 report released by the International Assessment of Agricultural Science and Technology for Development, a multinational effort spearheaded by the World Bank and the FAO, concluded that modern agriculture would have to shift rapidly away from industrialized systems and toward sustainable, small-scale, diversified farming systems in order to meet the challenges of population growth, hunger, environmental degradation, and climate change. And in March of this year, the UN Special Rapporteur on the Right to Food, Olivier De Schutter, issued a report asserting that small-scale farmers in the poorest regions could double their food production within 10 years by applying agroecological principles (see "The Agroecological Revolution"). He made this assertion based on the work of a number of agroecological researchers, including ESPM professor Miguel Altieri, and cited as evidence several recent studies of sustainable agriculture projects in poor countries that found substantial increases in crop yields — in some cases more than double — as well as improvements in the farms' environmental services. De Schutter urged countries and philanthropic groups to invest in research and adopt policies to help scale up agroecological practices. Kremen and a group of UC Berkeley colleagues from a variety of disciplines are leading the charge, establishing a new Berkeley Center for Diversified Farming Systems to bring together researchers, writers, and practitioners from many fields to focus on feeding the world's growing population through diversified, multifunctional agriculture that also addresses the poverty and lack of access to land that are the root causes of hunger. Thanks to support from the Neckowitz Family Foundation, the Berkeley Institute of the Environment has already hosted a series of roundtables and presentations on topics related to diversified farming systems, with more to come. up agroecological practices. In addition to Kremen, affiliated faculty include Altieri, Lynn Huntsinger (ESPM), Nathan Sayre (Geography), Alastair Iles (ESPM), Christy Getz (a Cooperative Extension specialist in the College of Natural Resources), David Zilberman (Agriculture and Resource Economics), and Justin Brashares (ESPM). Berkeley is uniquely positioned to host this interdisciplinary research and education center, Kremen says, because of its world-renowned faculty in the fields of agroecology, science, technology, society, agricultural economics, and rural sociology. Notes Huntsinger: "That's the beauty of our College, that we can bring all these things together."
These practices also provide pollination, pest and disease control, water purification, and erosion control. They help to build healthy, productive soil and reduce water use, as demonstrated by research conducted in both the Altieri and Kremen labs on farms in Napa, Sonoma, and Yolo counties (see On the Ground). "Diversified farming systems produce and regenerate the ecosystem services that the agricultural system needs," Kremen says. This allows farmers to forgo the harmful inputs and practices required in industrial farming, which is beneficial for the biodiversity that in turn produces the services. "I see it as a cycle." At the landscape scale, diversified farming practices include coordination among land managers to protect wildlands in and around agricultural areas, and the support of ecological practices on rangelands and in forests. "In California, 35 million acres of rangelands are providing all kinds of services, from habitat for pollinators to livestock products to viewsheds," says Huntsinger, a range ecologist and manager (see "Preserving Rangeland Biodiversity"). Some heritage systems, like the Ifugao rice terraces of the Philippines, maximize the use of mountainous terrain for rice production while incorporating stands of managed forest and a variety of aquatic and terrestrial wildlife. Other systems combine traditional farming techniques with modern ecological science and innovative marketing and distribution methods; Kremen points to Full Belly Farm in California's Capay Valley, which successfully raises more than 80 different crops, wresting a huge amount of produce from a small area. Even industrial farms can become more biodiverse through the application of improved techniques. Monocrops such as vineyards, for example, can be broken up with flowering cover crops, hedgerows, and corridors that help control pests without chemical inputs.
"We won't solve hunger and stop climate change with industrial farming on large plantations," De Schutter said in a statement accompanying the report's release. "The solution lies in supporting small-scale farmers' knowledge and experimentation, and in raising incomes of smallholders so as to contribute to rural development." Industrial agriculture isn't likely to disappear any time soon, and many experts believe that any solution to the twinned problems of hunger and resource depletion will require some combination of industrial and sustainable methods. Some, like agricultural economist Zilberman, argue that modern industrial technologies, particularly genetic engineering, could have a crucial role to play in helping agriculture to wean itself from the worst of its chemical abuses, through pest-resistant crop varieties, and to adapt to climate change by developing heat- and droughttolerant varieties. "Diversified farming systems are crucial to the future of the University, California, and even to global food production, but the concept really has to be inclusive of modern biotechnologies," Zilberman says. "It has to take the best of science that's sustainable and combine it with environmentalism." Kremen says that, while the economics perspective is a key one for this growing interdisciplinary group, she is skeptical about the ultimate value of genetic engineering, arguing that genetically modified organisms are just another variety of the reductionist, high-tech approach that has led to so many of industrial agriculture's worst abuses. "People love technological fixes," she says. "But spending so much effort to produce these engineered varieties that then have severe vulnerabilities or cause new problems is not, I think, a very good strategy. I'd rather see that effort put into coming up with agroecologically designed communities that do the same thing — that use water and nutrients really efficiently. " Altieri, who calls agroecology "the antithesis of transgenic technology," says that "there is not one acre of transgenics that feeds the one billion poor people. Transgenic corn and soybean are produced to feed cattle that the poor cannot afford, and for biofuels, canola, and cotton that don't feed anybody."
How much do tools like sustainable seafood campaigns affect consumers' choices? Are subsidies or regulations more useful in encouraging farmers to improve their farms' diversity? How can we preserve knowledge of traditional farming practices in areas where it is dying out? These are the kinds of questions that ESPM professor Alastair Iles (above) asks in his research.
"I focus on the public policy, science policy, and sociological dimensions of making a switch back to diversified systems from industrial agriculture in developed countries," Iles says. This focus has led him to compare the sustainability policies and actions of supermarkets in the United States and Britain; study the importance of innovative learning tools that promote sustainable agriculture by educating consumers about such issues as "food miles," the distance that food travels from farm to table; and evaluate the effectiveness of tools like sustainable seafood wallet cards versus more robust certification programs.
"Ranching isn't the first thing that leaps to people's mind as diversified farming," says ESPM professor Lynn Huntsinger (above, right), who specializes in rangeland conservation and management. Yet "privately owned rangeland is perhaps the most biodiverse undeveloped land in California," she says, because early settlers chose the most productive, best-watered land, and because grazing alters native ecosystems less than other uses, such as crop agriculture. This biodiversity supports a host of ecosystem services, including the pollination provided to farmers by wild bees (see Briefs).
Both Huntsinger and Nathan Sayre (above, left), an associate professor in the Geography Department who also studies rangeland management and ecology, collaborate with ranchers to devise land management practices that promote biodiversity and preserve their land from development.
Diversified farming systems aren't just about providing food and protecting the environment; to be truly sustainable, they must also provide a livelihood to farmers and farm laborers, and help support the communities that depend on them. That's where the work of Christy Getz (above), an ESPM-based Cooperative Extension specialist, comes in.
"My research is about diversified food systems," says Getz, who has studied farm labor conditions, food security among agricultural workers, and the challenges facing economically disadvantaged farmers. In one project, her team developed a program to help Southeast Asian refugee farmers in California scale up their operations, connect to alternative distribution systems, and access new markets for their produce, such as local schools.