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<br />American Academy of Arts and Sciences <br /> <br />Envirocmental Award, National Academy of Sciences, 1980 <br /> <br />Gustavson Distinguished Professor Emeritus, University of Colorado <br />1980 <br /> <br />Soviet Academy of Sciences, Foreign Member <br /> <br />University of Colorado Medal <br /> <br />University of Chicago Alumni Medal <br /> <br />Co-winner, Sasakawa International Environmental Prize, 1985 <br /> <br />Co-winner, John Tyler Prize, 1987 <br /> <br />xu <br />