Agence France-Presse: The United States wants China to accept slow increases in its greenhouse gas emissions until it hits a quot;peak year,quot; beyond which a real decrease must occur, US negotiator Todd Stern said Friday. Stern, briefing reporters following a trip to China, said he believed the Chinese authorities have taken quot;on boardquot; the concept of a peak year for carbon gases that cause climate change but have not specified what year that will be. quot;It matters a whole lot when that peak year is,quot; said …