The first thorough federal review of research on how global warming may affect extreme climate events in North America forecasts more drenching rains, parching droughts (especially in the Southwest), intense heat waves and stronger hurricanes if long-lived greenhouse gases continue building in the atmosphere.
rainNinth Street in Brooklyn, 2004. (Seth Wenig for The New York Times)
The report is distinct from last month's federal review of specific impacts of warming on agriculture, ecosystems, coasts and the like in the United States, focusing instead on how weather patterns will change. It also largely echoes, at the regional level, findings on global impacts from the Intergovernmental Panel on Climate Change last year.