Huffington Post: At 72, climate scientist James Hansen is retiring as head of NASA's Goddard Institute of Space Studies to work even more actively on climate-change issues. Keep in mind that, in congressional testimony in 1988, he first put climate change on the national map. "It is time to stop waffling so much," he told the congressional committee members, "and say that the evidence is pretty strong that the greenhouse effect is here." He then went on to suggest a future "probability of extreme events like summer...