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WATCH: James Hansen Explains Why He 'Must Speak Out About Climate Change'

DEBATE: Should The Keystone Pipeline Be Allowed In The U.S.?

Bill McKibben Warns Colbert: 'The XL Pipeline May Be Coming Back'

SOTU On Energy: 'We Don't Have To Choose Between Our Environment And Our Economy'

PHOTOS: A Look Back At Keystone XL Protests

Obama's Keystone XL Pipeline Rejection Brings 'High Water Mark' Of Respect From Some Groups

GOP Bill Would Force Action On Keystone XL

WATCH: Mark Ruffalo Speaks Out At Keystone XL Protest

Thousands Gather In Lafayette Park In Culmination Of Tar Sands Protests

Seinfeld Star: Rejecting 'Brutally Stupid' Pipeline 'Is A No-Brainer, Right Mr. President?'

Progressives Launch Anti-Keystone XL Pipeline Ad Campaign

PHOTOS: Money Doesn't Grow On Trees: Environmentalists Occupy Wall Street

WATCH: Bill McKibben Says 'Wall Street Has Been Occupying The Atmosphere'

Pipeline Debate Pits Neighbors Against One Another In Small Nebraska Town