Reuters: A U.N.-backed forest preservation scheme could become too valuable and complex, raising the risk local communities, the very people seen as key to the scheme’s success, could be shut out, scientists say. Reducing emissions from deforestation and degradation, or REDD, has already attracted billion of dollars of funding pledges from rich nations keen to see the scheme established as part of a broader global climate pact from 2013. REDD would allow developing nations to earn …