Hansen and team's research finds climate sensitivity is at least 4.5C for a doubling of CO2 with 99% certainty. Too bad COPS is using 3.0 like it is gospel. For some perspective, the CO2 baseline is around 285, and we're up to 425 (we're only 145 away from doubling and that's ignoring increases in fun things like methane and nitrous oxide). The amount to get to the doubled value is roughly the increase we have experienced in my lifetime, so it is not as far away as it might seem.

I guess I should invest in air conditioned farming.