We can deal with small and fast changes, or big and slow changes, but not big and fast. The problem is not the CO2 levels themselves, or the heat, or even the c

We can deal with small and fast changes, or big and slow changes, but not big and fast. The problem is not the CO2 levels themselves, or the heat, or even the climate. Life can exist and thrive in phenomenally hostile environments. It's the speed and size of the shift. Life needs time to adapt, depending on its size (which is why almost nothing >25 kg survived the K-T event). I'm comfortable when my car goes from 60 mph to 0 in half a minute. I'm not going to be comfortable when my car goes from 60 mph to 0 in a second.