Bloomberg: The backlog of United Nations greenhouse gas-reduction projects seeking emission credits surged more than sevenfold since the beginning of August, undermining efforts to curb climate change. The number of projects awaiting completeness checks before they can be registered jumped by 253, said David Abbass, a spokesman at the UN Framework Convention on Climate Change, or UNFCCC. That compares with 37 projects beforehand, Abbass said yesterday by e-mail. UN emissions trading “is …