Bill McKibben: Tar Sands pipeline is climate game over

For a fourth straight day outside the White House, environmentalists were arrested for peacefully protesting a pipeline that would carry acidic crude oil from Western Canada to the Texas Gulf Coast. Environmentalist and author Bill McKibben, who spent the weekend with fellow demonstrators in a Washington jail, discusses the the success of the protest and the shortcomings of Obama's environmental policy with Keith. McKibben echoes the warning from NASA's Jim Hansen that if the Tar Sands project goes forward it will be essentially "game over" for the climate.