Tbf, this guy (Jem Bendell) was saying 5 years ago that civilization could be gone by 2025 due to a climate apocalypse that is now too late to avoid. There's a lot to criticize about what he has said, but no one can claim that he doesn't know how bad climate change is, has been, or how bad it might get. For the most part he's considered the epitome of climate alarmism.