Not to...
"It's regressive, but the poor - i.e. the millions of non-productive consumers - are basically the problem here."
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Not to mention the fact that that's essentially arse-about-face. The poor are GOOD for the environment. The poor don't buy iThis and iThat and consume all the resources on the planet. We'd be fine if everyone lived in C14th style poverty - our impact on the environment would be negligible.
So the problem is fat, rich mofos fuelled by Thatcherite "me, me, me" capitalism. Personally I'd suggest nuclear war - the following winter would stop "global warming" and once we've blasted the human race back to WAY pre-industrial levels the remaining life can get on recovering.