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Our knowledge of past global disasters affecting Earth's biosphere is incomplete but not altogether comforting. Humans are latecomers to this planet. The short lifespans of individuals, tribes and nations is of little help in predicting the worst this planet and the medium it inhabits may have in store for it. This is another way of saying we just don't know what the average lifespan of life at any level of complexity on an earth type planet might be.

Toba catastrophe theory - Wikipedia, the free encyclopedia

[QUOTE="boomerang, post: 239037, member: 3872"] Our knowledge of past global disasters affecting Earth's biosphere is incomplete but not altogether comforting. Humans are latecomers to this planet. The short lifespans of individuals, tribes and nations is of little help in predicting the worst this planet and the medium it inhabits may have in store for it. This is another way of saying we just don't know what the average lifespan of life at any level of complexity on an earth type planet might be. [URL="https://en.wikipedia.org/wiki/Toba_catastrophe_theory"]Toba catastrophe theory - Wikipedia, the free encyclopedia[/URL] [/QUOTE]

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