President Obama , Chinese leader pledge to work to reduce carbon emissions . `` This kind of comprehensive agreement would be an important step forward in the effort to rally the world around a solution to our climate challenge . '' Move comes before Climate Change Conference . U.N in Denmark . Denmark and China are largest producers of greenhouse gases . Hu Jintao , Chinese President Hu Jintao do n't offer a timetable .
President Obama , Chinese leader pledge to work to reduce carbon emissions . Move comes before Climate Change Conference . U.N in Denmark . Denmark and China are largest producers of greenhouse gases . Hu Jintao , Chinese President Hu Jintao do n't offer a timetable .