James E. Hansen, the nation’s most outspoken scientist on global warming, is stepping down from his federal post to engage full time in activism on the issue.
Hansen, who heads NASA’s Goddard Institute of Space Studies in New York City, spent 46 years working at the agency.
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Juliet Eilperin is The Washington Post's White House bureau chief, covering domestic and foreign policy as well as the culture of 1600 Pennsylvania Avenue. She is the author of two books—one on sharks, and another on Congress, not to be confused with each other—and has worked for the Post since 1998.