Reply to post: 'Or intelligent civilisations evolve, but then self-destruct'

ALIENS are surely AMONG US: Average star has TWO potentially Earth-like worlds

Anonymous Coward
Joke

'Or intelligent civilisations evolve, but then self-destruct'

With the author in mind, a reasonable guess is they industrialize, then get wiped out by global warning.

Kindly observe the icon.

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