Miami Herald: Just before he and other environmentalists marched to the White House on Tuesday, climate change activist James Hansen warned he wouldnt be able to be arrested with them this time. Hansen, a NASA scientist by day and an activist on his own time, had to be available for a press conference in the afternoon announcing that worldwide temperatures in 2012 were in the top 10 hottest ever recorded. Id be honored to be arrested with you, Hansen said. A few hours later, he declined to discuss politics...