"The tendency of those committed to the theory of catastrophic man-made global warming to unquestioningly adopt the assumptions, at every stage, that maximise the expectation of calamity should alert us that groupthink is driving the movement."

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The exact sciences also start from the assumption that in the end it will always be possible to understand nature, even in every new field of experience, but that we may make no a priori assumptions about the meaning of the word understand.

— Werner Heisenberg