Quote:
Originally Posted by Flint
But it only takes one, right? And *by definition* it hasn't happened yet.
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Yup.
My dad predicted he was going to die many times. Then he did.
The history of life on our planet is of verdant flourishings and cataclysmic extinctions. Sometimes the stuff that life was doing caused the extinction by fundamentally altering the environment it relied upon for survival. Other times 'external' forces came together to create an environment that no longer supported a given type of life. Sometimes just a few species, occasionally most of the species.
Saving the possibility that humans might find a way to self sustain on other worlds, sooner or later we will face extinction.