The word "everything" is doing a lot of heavy lifting there. Of course we don't know everything, but we certainly know enough to warrant extreme pessimism. Nam

The word "everything" is doing a lot of heavy lifting there. Of course we don't know everything, but we certainly know enough to warrant extreme pessimism. Namely: - we know a mechanism that causes global warming, which is empirically proven and theoretically backed. - multiple scenarios of positive feedback loops that result in rapid warming - very few ideas even for positive feedback loops that result in cooling - little to no demonstrated political will to act decisively. Seems to me like we know a lot!