May 25, 2011. A proposal by a United Nations panel that helps oversee the world's second-biggest carbon market will reduce emission credits from plants that cut hydrofluorocarbon- 23 by 32 percent through 2030, IdeaCarbon said. The proposal would allow for the creation of 1.11 billion metric tons of credits through that year, instead of 1.63 billion tons under a "business-as-usual" scenario. IdeaCarbon rates emission-reduction projects in developing nations. Regulators are clamping down on projects that reduce emissions of HFC-23, which has a global-warming potential 11,700 times more powerful than carbon dioxide, and the European Union earlier this year banned the use of credits linked to the industrial gas in its emissions-trading system from May 2013.