> If it is the case that actually the climate has often been warmer without any significant CO2 emissions having taken place - suggesting that CO2 emissions sim

> If it is the case that actually the climate has often been warmer without any significant CO2 emissions having taken place - suggesting that CO2 emissions simply aren't that important... How does one follow the other? Just because it's been that hot "naturally" doesn't in itself imply that CO2 isn't causing the warming now, nor that CO2 won't cause warming to rise over Roman levels.