So Obama has sunk the Keystone XL pipeline—at least temporarily. He has said Trans Canada can apply again, so perhaps he’s just being an election-year tease. Nonetheless, it’s a victory against the tar sands monolith. And that’s what it’s all about, not just shutting down a pipeline, but shutting down the tar sands. James Hansen, one of the U.S.’s foremost climate scientists and the head of
