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US Commerce Secretary Gary Locke (2nd from L) and Secretary of Energy Steven Chu (2nd from R) visit the US Futurehouse Zero-Net-Energy Healthy House in Beijing, July 16, 2009. Locke, who is making his first trip to China as a member of the Obama administration along with Energy Secretary Steven Chu, said the two countries need to work together to reduce greenhouse gases blamed for global warming. He also paid a visit to a clean-power company at the Beijing Economic and Technological Development Area on Wednesday. [CFP]