We have fouled the nest so thoroughly and in so many ways that I would be absolutely shocked if humanity comes out the other end of this century with any level of organization above that of clans and villages. It’s not just carbon emissions and global warming, it’s depleted soil fertility, it’s synthetic estrogens bioaccumulating in the aquatic food chain, it’s our inability to stop using antibiotics in a way that gives rise to multi-drug-resistance in microbes.