Dr. James Hansen educates Tea Party Senator Ron Johnson (R-WI) on the facts of climate change during a Senate Committee hearing on whether the Keystone XL pipeline should be approved. Subscribe to The Daily Conversation for the best videos from congress https://www.youtube.com/TheDailyConversation Facebook http://www. FACEBOOK /thedailyconversation Google+ https://plus.google.com/100134925804523235350/posts Twitter http://www.#/thedailyconvo , climate change,scientist,Energy,James Hansen,Ron Johnson,Senate,news,politics,president