"Two top Obama administration officials arrived Wednesday at the U.N.-sponsored climate talks that opened this week offering both diplomacy and a tough line: The United States is willing to be a full partner in fighting climate change, but the real problem is with China and the developing world."

"Negotiators on Wednesday worked to bridge the chasm between rich and poor countries over how to share the burden of fighting climate change, and a top U.S. envoy was to highlight the Obama administration's efforts to curb greenhouse emissions."

"The current decade has been by far the warmest decade on instrumental record, the U.K.'s Meteorological Office said Tuesday as it released new figures at the climate change talks in Copenhagen."

"The head of the U.N.'s panel of climate scientists on Monday strongly defended findings that humans are warming the planet, after critics said that leaked emails from a British university had undermined evidence."

"The Obama administration's greenhouse gas ruling Monday was meant to send a warning to industry, the U.S. Congress, and the world: with or without a law, Washington will tackle global warming in a serious way."

"In the long term, the Earth's temperature may be 30-50% more sensitive to atmospheric carbon dioxide than has previously been estimated, reports a new study published in Nature Geoscience this week."

"The largest and most important U.N. climate change conference in history opened Monday, with organizers warning diplomats from 192 nations that this could be the best, last chance for a deal to protect the world from calamitous global warming."

"A very large, 30-year study of just about everyone in Scandinavia shows no link between cellphone use and brain tumors, researchers reported on Thursday."