Dr. Jim Hansen, director of NASA's Goddard Institute for Space Studies in New York, testifies before a Senate Transportation subcommittee on Capitol Hill in Washington, D.C., Monday, May 9, 1989. Hansen told the committee that the Office of Management and Budget forced him to contradict, within his own prepared statement, his findings that a buildup of greenhouse effect gases would increase the likelihood of drought. (AP Photo/Dennis Cook)

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