But we don't know that the endgame is extinction of the race. We don't even know when various benchmarks will occur ( say, sea level at x% higher ) . The physi

But we don't know that the endgame is extinction of the race. We don't even know when various benchmarks will occur ( say, sea level at x% higher ) . The physics of a Venus aren't on the table - SFAIK, all the carbon we're digging up and burning was once animal or vegetable matter, derived from a Carboniferous era level of atmospheric CO2.