Caldeira, of the Carnegie Institution, has been investigating geoengineering claims for years. This year he was brought in by the British government to talk about ways in which we could geoengineer the climate to save us from global warming. If we don't get greenhouse gas emissions down, we're going to need a Plan B - and people like Caldeira to do the research for us. He's also been asked to organise a session on geoengineering in Copenhagen next year, where world leaders will meet to sign the successor to the Kyoto protocol.
Cheers! Sam Carana