[stareatgoats]

Don't think that person really overdid it much, except for being so specific on the timing. The reality is that no-one knows exactly what the combined effect of climate-forcing factors will be, or when. It could be a catastrophe, or it might not be so bad (as some people fear)

Quite a few things a likely to change though, just as climate change always did; previously fertile lands will likely become deserts, and vice versa. Which means animals and plants all will be on the move, and some will not have time to adapt and perish. Humans are more adaptable, and would not necessarily face an extinction, but the conflicts that follow may be fatal.