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.

 

But environmentalists say rich nations could be wasting billions of dollars on what some are calling "perverse financial incentives," because some of the largest projects funded by the U.N.-managed CDM are a golden goose for chemical makers without making meaningful cuts in emissions.