After their first summit president Obama, and his Chinese counterpart Hu Jintao (hoo jihn-tow vow cooperation but reach little agreementThe two leaders are pledging to work together on top global issues, including climate change, nuclear disarmament and economic recovery.On the other side differences remained evident on their stances on human rights, trade and military tensions.Wednesday the president will get a tour of the great wall.Then it's on to South Korea, the final stop on his Asia tour.