Chinese President Hu Jintao left here for home on Friday after attending UN meetings in New York and the Group of 20 (G20) summit here. Hu started his U.S. trip on Monday from New York, where he attended the UN climate change summit on Tuesday, delivered a speech in a general debate of the UN General Assembly on Wednesday, and participated in a UN Security Council summit on nuclear non-proliferation and disarmament on Thursday. At the UN climate change summit, Hu called for stronger international efforts to tackle climate change and introduced what China has been doing and plans to do in this regard. During the general debate of the UN General Assembly, the Chinese leader expounded China's stance on major regional and global issues, and outlined China's ideas on efforts to safeguard world peace, boost common development, promote mutual benefit and seek harmonious co-existence. At the UN Security Council summit on nuclear non-proliferation and disarmament, Hu put forward the idea of seeking a common security through a win-win approach for mutual benefits. He elaborated upon China's propositions on nuclear non- proliferation and disarmament, peaceful use of nuclear power and nuclear security. At the Pittsburgh summit, President Hu explained China's position on efforts to push for world economic recovery, reform the international financial system, and achieve a balanced and sustainable growth worldwide. 