Xie Zhenhua, China's top climate envoy, attends the opening ceremony of the UN Climate Change Conference 2009 in Copenhagen in this picture taken December 7, 2009. China urged President Barack Obama to increase a U.S. offer to cut carbon emissions but Zhenhua indicated willingness on December 9, 2009 to compromise at a U.N. conference in Copenhagen. Picture taken December 7, 2009. REUTERS/Bob Strong