Stephen Chu is in China, the world's top emitter of the greenhouse gases that cause global warming, to urge greater Sino-American cooperation to combat the problem.

正在中国访问的朱棣文敦促美中两国合作防范全球气候变暖。

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So in 2010, Stephen Chu, Secretary of Energy, said that the DoE would organize it, but since then, very little has happened and the White House rooftop is still sans solar panels.

FORBES: Mr President, Bo Getting Solar Doesn't Keep Your Promise: Please Put It On The White House