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Runoff of nitrogen and other chemicals from farm fields into rivers and then coastal waters has triggered the development of more than 400 “dead zones” that are depleted of fish and other sea dwellers.

Annual crops do, however, have some advantages over perennial crops in terms of management flexibility.

Currently, these efforts receive little public funding, in marked contrast to the extensive public support for cellulosic ethanol technologies capable of converting perennial biomass crops into liquid fuels. Department of Agriculture (USDA) and the National Science Foundation (NSF) could greatly expand and accelerate perennial grain breeding programs.

Yet perennial grain crops promise much larger payoffs for the environment and food security and have similar timelines for widespread application. Additionally, the farm bill could include support for the development of perennial breeding programs.

During the past decade, plant breeders in the United States have been working to develop perennial versions of wheat, sorghum, sunflowers, and legumes.

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These programs could make it possible to develop radically new and sustainable farming systems within the next 10 to 20 years.Since the initial domestication of crops more than 10,000 years ago, annual grains have dominated food production.The agricultural revolution was launched when our Neolithic ancestors began harvesting and sowing wild seed-bearing plants.And because of factors including climate change, rising energy costs, and land degradation, the number of “urgently hungry” people, now estimated at roughly 1 billion, is at its highest level ever.More troubling, agriculture-related problems will probably worsen as the human population expands—that is, unless we reshape agriculture.

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