holdren, mr.sandalow, assistant secretary, distinguished guests, ladies and gentlemen, good morning. i'm very glad to turn the china of u.s. relations for a for the 21st century and the session of strategic forum on u.s.-china clean energy cooperation. i believe cooperation is highly important. this is what we need urgently. on behalf of the ministry of science and technology of china i would like to congratulate on the convening of this form. my thanks go to the brookings institute and the china institute for innovation development strategy for your preparation and arrangements. thank you. >> ladies and gentlemen, efforts of the international community, the world economy is slowly recovering. but this recovery is after the basis with the balanced progress and certain uncertainties. meanwhile, however, as my friend, dr. holdren, mentioned climate change, energy and resource security, a major natural disasters, etc. as well as over global challenges against more prominence. but energy development f