A few weeks ago environmental leaders - including Maude Barlow, Wendell Berry, Tom Goldtooth, James Hansen, Naomi Klein, Bill McKibben and David Suzuki - called for civil disobedience at the White House to stop the Keystone XL Pipeline from Canada's tar sands, through Montana and the Great Plains, and then down to refineries in Texas. So far, 162 people have been arrested at the White House.