Reuters: Carbon market prices could tumble by 75 percent if credits for safeguarding forests are added to markets for industrial emissions, environmental group Greenpeace said on Monday. A report issued on the sidelines of U.N. talks in Bonn working on a climate treaty said that a flood of forest carbon credits could also slow the fight against global warming and divert billions of dollars from investments in clean technology. “Cheap forest credits sound attractive but a closer …