New York Times: The United Nations will hold President Obama to his promise that the United States will reduce carbon emissions even if the Senate cannot pass climate legislation, U.N. climate chief Yvo de Boer said this morning. In his first public comments since the Copenhagen climate summit last month that produced a nonbinding promise from major-emitting countries to cut greenhouse gases, de Boer noted that Obama vowed the United States will slash carbon about 17 percent below 2005 levels in the …