"The Senate declined Thursday to take up Sen. Lisa Murkowski’s effort to limit for a year the Environmental Protection Agency's ability to regulate greenhouse gas emissions from power plants, factories and other stationary sources of pollution."

"Climate researchers now predict the planet will warm by 6.3 degrees Fahrenheit by the end of the century even if the world's leaders fulfill their most ambitious climate pledges, a much faster and broader scale of change than forecast just two years ago, according to a report released Thursday by the United Nations Environment Program."

"After weeks of waiting, it now looks like the Senate will see a climate bill next week after all. At an event in Pittsburgh ahead of the G20 summit, bill cosponsor John Kerry (D-Mass.) announced that the bill will be released next Wednesday."

"REDD -- A plan to save the world's rainforests looks like it could carry the day at the international climate talks in Copenhagen in December."

"In the end, the two most important world leaders at the first-ever U.N. Summit on Climate Change didn't say enough to satisfy supporters or quell critics."

"China laid out a plan to curb carbon emissions by 2020 and U.S. President Barack Obama called on all nations to act now to tackle global warming, as world leaders tried to inject momentum into climate change talks."

"The Environmental Protection Agency said on Tuesday that it would require the nation’s biggest emitters of greenhouse gases to start tracking their emission levels on Jan. 1 and report them to the government."

"A possible amendment from Sen. Lisa Murkowski (R-Alaska) has the potential to handcuff U.S. EPA from exercising its full regulatory power [over greenhouse gases], a scenario that has sent shockwaves through the environmental community."

"The world leaders who are meeting at the United Nations to discuss climate change on Tuesday, are faced with an intricate challenge: building momentum for an international climate treaty at a time when global temperatures have been stable for a decade and may even drop in the next few years."

"A two-judge panel of a federal appeals court has ruled that big power companies can be sued by states and land trusts for emitting carbon dioxide. The decision, issued Monday, overturns a 2005 District Court decision that the question was political, not judicial."

"On Tuesday, the U.N. is holding a day-long Climate Summit (alongside its annual, two-week General Assembly) in New York City. And on Thursday and Friday, the Group of 20 (G20) leading world economies is gathering in Pittsburgh, its third meeting of the year to deal with the global economic meltdown."

"Representatives of the world's 17 biggest carbon polluters kicked off a week of high-stakes talks on climate change Thursday with a discussion at the US State Department."

"With Congress moving slowly on a measure to curb industrial greenhouse gas emissions, the United States may find itself with little sway at the coming international conference to construct a new pact aimed at easing global warming."

"Dakota, Minnesota & Eastern Railroad this summer started to walk away from its rail expansion project in the Powder River Basin, the largest source of coal in the country, citing the flagging U.S. economy and regulatory uncertainty."

Scientists use treetop gondolas in the Gifford Pinchot National Forest in southeast Washington to study the effects of global warming on trees.