We're at 400 ppm CO2 right now. So your feeling is that we'll probably start reducing carbon emissions once we double the amount of carbon in the air? 450 ppm

We're at 400 ppm CO2 right now. So your feeling is that we'll probably start reducing carbon emissions once we double the amount of carbon in the air? 450 ppm is often held up as a catastrophic point of no return. I don't know if that's alarmist. Let's say it is! Maybe we'd have to get all the way to 600 ppm before it was genuinely a catastrophe. But I'm pretty confident that if we reach 700 ppm, we're fucked.