Obama and Hu hold joint press conference in Beijing.

U.S. President Barack Obama (L) and China's President Hu Jintao attend a joint press conference in the Great Hall of the People in Beijing on November 17, 2009. The major challenges of the 21st Century from climate change to nuclear proliferation to economic recovery are challenges that touch both our nations, and challenges that neither of our nations can solve by acting alone, Obama said. UPI/Stephen Shaver Photo via Newscom

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