President Obama , Chinese leader pledge to work to reduce carbon emissions . Comment: Climate Change Conference in Denmark . The U.S. president said the two leaders want to accelerate the world toward a pact to cut greenhouse gases . China and U.S. are largest producers of greenhouse gases . Obama , Chinese President Hu Jintao do n't offer a timetable .
President Obama , Chinese leader pledge to work to reduce carbon emissions . Comment: Climate Change Conference in Denmark . China and U.S. are largest producers of greenhouse gases . Obama , Chinese President Hu Jintao do n't offer a timetable .