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PULLMAN, Wash.-A group of leading scientists, economists and farmers is calling for a broad shift in federal policies to speed the development of farm practices that are more economically, socially, and environmentally sustainable. 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.