> How do you know we need to care? The temperature difference between now and the last ice age, at a time there was 3km of ice over much of the northern hemisp

> How do you know we need to care? The temperature difference between now and the last ice age, at a time there was 3km of ice over much of the northern hemisphere, and sea level was 120 below current average, was 5°C. Current predictions for the temperature increase in 2100 range from 2°C, if we make a huge effort to quickly and drastically reduce CO2 emissions, to 5°C if we keep going as we are. The reality will be somewhere between, I'll let you decide what you think is likely. We don't know exactly what the consequences are gonna be, but we know they're going to be dramatic, and if you think they won't affect you personally, you're probably wrong.