He worked for the UNDP Beijing Office as an adviser on environment and development; Lead author of the IPCC Working Group III 3rd, 4th and 5th Assessment Report on Mitigation; Ex-director-general, Institute for Urban and Environmental Studies, the Chinese Academy of Social Sciences. Member of China National Expert Panel on Climate Change; Member of National Foreign Policy Advisory Group; Adviser to the Ministry of Ecology and the Environment. President of Chinese Association for Urban Economy, vice president of the Chinese Society of Ecological Economists. Author of over 300 papers, articles and books in both English and Chinese. First and Second prize of best research work, Chinese Academy of Social Sciences (2002, 2004 & 2013), Winner of Sun Yefang Award of Economic Sciences, 2011, China Green Person of the Year 2010/2011. China Environment Prize (2016).