Real Climate has a good post on geo-engineering and why it is only fitting as a final act of desperation, not a policy platform. It expresses very well all my own misgivings (it's a terribly dangerous one-chance-to-get-it-right experiment on the entire planet, it commits the human race to centuries of climatic meddling, it will ultimately be more expensive and harder to agree on than simply reducing CO2) so I won't enumerate them here, just go read it all there.
But I will emphasize one of the points Ray Pierrehumbert mentions that is too often overlooked.
As anyone who follows the science…
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