Voice of America: The United Nations’ climate chief is expressing optimism about the movement among various countries to discuss a global carbon-emissions treaty, less than two months after the Copenhagen conference failed to achieve such a deal. Gatherings of the European Union, the Group of Eight, the G20 and other international bodies discussing climate change will not sideline the U.N. effort for a sweeping global environmental agreement. That is what the world body’s climate chief, Yvo de Boer, …