One of the nation's foremost experts on climate change was arrested outside the White House on Monday morning after he joined a protest against a planned Canadian tar sands pipeline.
Dr. James Hansen (pictured), who runs NASA's Goddard Institute for Space Studies, was arrested along with 139 other protesters taking part in a series of demonstrations against the planned $7-billion Keystone XL pipeline, which would transport 500,000 barrels of crude per day from America's neighbor to the north all the way to the Gulf coast of Texas.