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But in the history of the solar system, and even in human history, there are clear records of extraordinary and devastating catastrophes. We humans have now achieved the dubious distinction of being able to make our own major catastrophes, both intentional and inadvertent. On the landscapes of other planets, where the records of the past are better preserved, there is abundant evidence of major catastrophes. It's all a matter of timescale. An event which is improbable in a hundred years, may be inevitable in a hundred-million.— Carl Sagan
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