The U.N. Spinoff Group on Emissions Trading and Project-Based Mechanisms recommended June 15 that certain tradable credits issued under the Kyoto Protocol remain valid the protocol’s first compliance period expires at the end of next year. The organization, a contact group associated with the U.N. Climate Change Conference, said in a discussion paper that the move could add stability to emissions trading markets. The group also recommended that the executive board of the Clean Development Mechanism should continue after 2012.