4 ms·Venus may have been temperate and potentially habitable for most of its history3 points by bryanrasmussen 1mo agochistev 1mo agoIn the book Cosmos, I think Carl Sagan speculated that it might have been home to an ancient civilization that brought about its own demise from industrial induced global warming which ran away.laruss5 1mo ago[dead]beardyw 1mo agoAs was the earth.