I wonder how much of the problem would be avoided if the top personal CO2 emissions per capita were capped at Scandinavian upper middle-class level since 1970 (imported CO2 included). Flying on vacation only occasionally, comfy car yes, SUV just if needed, nice modern house yes, wasteful lack of insulation no, buy what you need and treat yourself to some fashion, electronics etc. yes, mindless consumerism no. Just a comfy standard of living.
I wonder if the mindless consumerism in certain countries with insane emissions per capita makes up a big part of the problem, or if the sheer number of "decent standard of living" would have pushed us over the edge anyway.