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This looks like an interesting organization:
[[Gigaton Throwdown Initiative]]
Their 2009 report supposedly lists 9 ways to chop CO2 emissions by a gigatonne per year by 2020. (Note: a gigatonne of CO2 is a lot less than a gigatonne of carbon.)
I haven't looked at it yet; I hope and imagine that it's more detailed than the Pacala-Socolow [[Stabilization wedges]] paper.