What you fail to allow is that Anthropogenic Global Climate Change alarmists claim that, unless we do reduce our emissions by 80% (and, in the case of the Al Gore scale nut, by 90-95%), we're doomed. Game over. We're ed.
It seems they've overplayed their hand.
First of all, you'd have to convince me we can appreciably affect global climate, at all. Then second, you'd have to advance a cost/benefit analysis that doesn't put us all on the plane of Somalia in trying to achieve that affect -- however small or big it would be..