"Here's what the historic meeting in Denmark can—and should—accomplish."

"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 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."

"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 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."

"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."

"Poland's Bialowieza National Park is home to some of the most impressive trees in Europe. Old growth oak, ash, spruce, hornbeam, linden, lime, and pine tower out of sight, their trunks dripping with luscious moss. For millennia these trees (some of which are more than 600 years old) have harbored legions of top carnivores, rare bugs, birds, and plants. Three packs of wolves range the park's wilderness, along with bison, lynx, wild boar, roe and red deer, otter, cranes, storks, three kinds of eagle, and four owl species." The park faces a number of threats, especially logging."

"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."

"Asian rice farmers typically do not fly around the world on holidays or own big-engine cars but scientists say they have an important role to play in helping cut the world's output of greenhouse gases."

"Germany's top climate researcher says he hopes he and his fellow scientists around the world have got it all wrong about global warming. Hans Joachim Schellnhuber, head of the Potsdam Institute for Climate Impact Research, told Reuters he gets no pleasure at all in being a prophet of doom and hopes he and his colleagues have overlooked effects that could still arrest climate change."

"For eight months, the Quebec government has been holding on to a report that explores the link between asbestos-related cancer and Canada's only community that still mines the substance."

"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."

"Twenty-five years ago Thursday, a leak of the chemical methyl isocyanate -- MIC -- killed thousands of people who lived near a Union Carbide plant in Bhopal, India. It was the worst industrial disaster in history. Since then, residents of the Kanawha Valley have lived with and periodically complained about the huge stockpile of MIC at a sister facility, the former Carbide plant in Institute."

"A new top inspector took charge Tuesday of the International Atomic Energy Agency as it faces one of the most turbulent periods in its 52-year history." Also: "The newly elected chemical weapons chief says he will pursue the last seven holdouts — including Israel, Egypt and Syria — to get them to sign a disarmament treaty and submit weapons stockpiles for inspection."