Huffington Post: On Thursday, after retiring from NASA to pursue environmental activism, James E. Hansen published an op-ed in the Los Angeles Times warning that the Keystone XL pipeline, if approved, would exacerbate global warming and put the U.S. on the hook for oil spills and environmental degradation.
The op-ed marks the first move in Hansen's new career as a carbon campaigner, after nearly half a century spent as NASA's most famous climate scientist at the agencys Goddard Institute for Space Studies. In...