'An obscure U.N. board that oversees a $2.7 billion market intended to cut heat-trapping gases has agreed to take steps that could lead to it eventually reining in what European and U.S. environmentalists are calling a huge scam.At a meeting this week that ended Friday, the executive board of the U.N.'s Clean Development Mechanism said that five chemical plants in China would no longer qualify for funding as so-called carbon offset credits until the environmentalists' claims can be further investigated...Read more: