Our planet was 20 degrees warmer overall that last time the CO2 levels were over 420ppm. And the level of rise over the recent past is totally unprecedented. Cl

Our planet was 20 degrees warmer overall that last time the CO2 levels were over 420ppm. And the level of rise over the recent past is totally unprecedented. Climate zones are moving tens of miles per decade north, far faster than forests can adapt. Things are going to get very crazy and the hunan population won't just decline gradually.