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The only way of cutting world greenhouse emissions that does not rely on technologies that don't exist yet is to cut productivity. Cutting productivity lowers standards of living. Lowering standards of living in much of the world means lowering it below subsistence level. That means people die, and lots of them. A 2% decrease in the planet's population is 120 million people dead.
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I call b.s.
Let's use one atmospheric pollutant--carbon monoxide--as a representative case.
Based on EPA data, total national emissions (total, not per capita) of carbon monoxide decreased by 31% from 1970 to 1998. [
Report (big file, see Fig. 3-1)]. You know what? The world economy didn't collapse over this time, in fact it has boomed--and hundreds of millions haven't died either, in fact, standard of living has improved on the whole.
Your doomsday scenarios regarding GHG control are completely overblown.