James Hansen: Why I must speak out about climate change - YouTube

https://www.youtube.com/watch?v=fWInyaMWBY8&src_vid=JrJJxn-gCdo&feature=iv&annotation_id=annotation_2510284695

http://www.ted.com Top climate scientist James Hansen tells the story of his involvement in the science of and debate over global climate change. In doing so...