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You have to believe in facts. Without facts there's no basis for cooperation. If I say this is a podium and you say this is an elephant, it's going to be hard for us to cooperate, i can't find common ground if somebody says that climate change just isn't happening, when almost all the world's scientists tell us it is. I don't know where to start talking to you about this. If you say it's an elaborate hoax, where do we start ?