"As I've thought about gay marriage, I don't see any reason not to say that [couples] should be able to get married."

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The fight around climate change, which I've spent my life on, is somewhat more difficult than gay marriages because no one makes trillions of dollars a year being a bigot, and that's how much the fossil-fuel industry pulls in pumping carbon into the air. But the principle is the same, I think.

— Bill McKibben