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Proceedings of the National Academy of Sciences of the United States of America|March 4, 2011
Recent warming by latitude associated with increased length of ragweed pollen season in central North AmericaLewis Ziska, Kim Knowlton, Christine Rogers, et al.Science (New York, N.Y.)|July 26, 2005
Global consequences of land useJonathan A Foley, Ruth Defries, Gregory P Asner, et al.Pageof 14