their responsibilities and act on behalf of our shared prosperity and security. that's exactly the strong of strong cooperation we've forged in pittsburgh and earlier this new york. indeed, on issue after issue, we see the international community is beginning to move forward together. at the g-20, we've achieved a level of global cooperation we have never seen before while also acting to address the threat posed by climate change. at the united nations security council, we passed a historic resolution to store loose nuclear materials, to stop the spread of nuclear weapons and to seek the security of a world without them. as we approach negotiations with iran on october 1st, we have never been more united in standing with the united kingdom, france, russia, china and germany in demanding that iran live up to its responsibilities. on all of these challenges, there is much more work to be done. but we leave here today more