New York Times: James E. Hansen, the climate scientist who issued the clearest warning of the 20th century about the dangers of global warming, will retire from NASA this week, giving himself more freedom to pursue political and legal efforts to limit greenhouse gases. His departure, after a 46-year career at the space agencys Goddard Institute for Space Studies in Manhattan, will deprive federally sponsored climate research of its best-known public figure. At the same time, retirement will allow Dr. Hansen to...