Participating in a Google+ conversation on Tuesday, Al Gore accused the Koch brothers of being "purveyors of the dirtiest energy on earth," Newsbusters first reported.
"[Obama's] got a big decision coming up on the XL Pipeline for these awful, filthy tar sands that, you know, Canada just said, 'Don't take it across British Columbia. We're not going to put up with that. It's just too dirty and too dangerous," the former vice president said.
"And they want to put a pipeline right down through very environmentally sensitive parts of our country so they can export it from the Gulf of Mexico to China," he continued. "Well, the hell with that. It's the dirtiest form of fuel on the planet, except for its byproduct, petroleum coke, or pet coke, that's piling up on the Detroit River right now, part of it, thanks to the Koch brothers — the purveyors of the dirtiest energy on earth. This is an atrocity, these tar sands. It really, and so, he ought to veto that, and I hope that he will."
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