Bloomberg: China is working on how to cap its greenhouse gas for the first time, an effort that would spur the worldwide effort hold back climate change. The world's biggest producer of fossil fuel emissions has been studying for more than a year how and when it might be able to make its pollution levels peak and hopes to act as soon as possible, said Xie Zhenhua, China's lead envoy to the United Nations global warming talks. "China will behave in a very responsible way for Chinese people and the world and...