One of the peculiar properties of species--all species--is that they tend to go extinct, sometimes suddenly.

The survival of the human species is an infinitesimal fraction compared to the survival of very, very early life forms who reigned for millions of years, or even of certain bacterial forms. We are just beginners. But, we have a higher ratio of impact per person on the environment than most other species. So we have the distinct possibility of not getting much more practice.

Barring that, there's always a sudden meteor impact, or the explosion of Yellowstone, etc.


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