I didnt realize this place was so infested with people that have swallowed the environmental catastrophe koolaid. Even if we accept the models as correct (they likely are not, but lets ignore that) the timelines to destruction are measured in centuries in all but the most insane models and pretty much all the models fail to take into account the likely topping out of population growth and beginning of.population shrinking that will almost certainly happen later this century. The faster we get to Mars (or oneill cylinders or some other viable off planet backup) the faster we can get them to self sustaining. So in the face of uncertainty it is insane to have the opinion that we shouldn't be working on offside backup because we very well could have it self sustaining before a catastrophe actually happens because we don't really know when the catastrophe will occur and our predictions are likely dramatically incorrectly biased to pessimism