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The climate change most important to Richard Sandor and the Chicago Climate Exchange (CCX) in 2008 will be political. More than a decade after the US Senate refused to ratify the Kyoto Protocol limiting greenhouse gas emissions, effectively dismissing the threat of global climate change, Sandor believes emission limits are now inevitable. "I think it's a question of when. With six or seven bills now going through Congress and the Senate, it's a sea change. Of the US presidential candidates, Obam