Writing in the journal Science, they say current policies focus on the production of a few crops and a minority of farmers while failing to address farming's contribution to global warming, biodiversity loss, natural resource degradation, and public health problems.

"We have the technology and the science right now to grow food in sustainable ways, but we lack the policies and markets to make it happen," says John Reganold, a Washington State University soil scientist and the Science paper's lead author.

Starting in the late 1980s, Reganold pioneered several widely cited side-by-side comparisons showing organic farming systems were more earth-friendly than conventional systems while producing more nutritious and sometimes tastier food.

His Science co-authors include more than a dozen other leading soil, plant, and animal scientists, economists, sociologists, agroecologists and farmers.

The Science paper grows out of several national efforts to address concerns about farming's impact on the environment, including the landmark 1989 National Research Council report, Alternative Agriculture, which recommended greater research and education efforts into sustainable farming. All the authors of the Science paper wrote the council's 2010 update, Toward Sustainable Agricultural Systems in the 21st Century.

The paper is particularly critical of the Farm Bill, which is slated for renewal next year. While only one-third of farmers receive payments under the bill, it has an outsized influence on production.

It does little to promote sustainability, write the authors, while "distorting market incentives and making our food system overly dependent on a few grain crops mainly used for animal feed and highly processed food, with deleterious effects on the environment and human health." Environmental impacts, says Reganold, include overdrawn aquifers, eroded soil and polluted water.

Meanwhile, he says, agricultural research and the field of "agroecology," which adapts the principles of nature to farming systems, are finding new ways to grow abundant and affordable food while protecting the environment, helping farm finances, and contributing to the well-being of farmers, farm workers and rural communities.

Consumers-whose concerns range from farm working conditions to animal welfare to food safety-are seeking out organic and alternatively grown foods at grocery stores, farmer's markets, food coops, Community Supported Agriculture networks, and large outlets like Trader Joe's, Whole Foods, even Costco.

The mounting environmental impacts of agriculture call for a transformation that can be sped up by shifting federal support to research, policies and markets that support more benign alternative farming systems.

"We need to move more quickly," says Reganold. "Why are we supporting big, mainstream agriculture that's not necessarily protecting or benefiting the environment? Why don't we support innovative farming systems of all sizes that produce food sustainably?"

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