"He who claims to be sure of something for which there is no evidence is a fool, and he who acts on the basis of what cannot be proved is an imposter."

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From wherever the emissions come, they have the same effect: They trap much more heat from the sun, melt the ice, raise the sea level, cause stronger storms, floods, drought, bigger fires, generate millions of climate refugees, destabilize political systems, threaten the growing of food crops and cause a number of other catastrophic consequences which, taken together, threaten the basis for the future of human civilization on the Earth.

— Al Gore