Optimizing Nitrogen Management in Food and Energy Production and Environmental Protection: Summary Statement from the Second International Nitrogen Conference por Ellis Cowling, James Galloway, Cari Furiness, Mary Barber, Ton Bresser, Ken Cassman, Jan Willem Erisman, Richard Haeuber, Robert Howarth, Jerry Melillo, William Moomaw, Arvin Mosier, Kaj Sanders, Sybil Seitzinger, Stan Smeulders, Robert Socolow, Daniel Walters, Ford West, Zhaoliang Zhu

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