"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."

"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."

"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 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."

"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.

"U.S. EPA is poised to establish a national registry for heat-trapping emissions after the White House [Sept. 16] completed its review of the agency's final greenhouse gas reporting rule."

"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."

The U.S. State Department issued an international proposal jointly with the governments of Canada and Mexico this week to phase down the production and consumption of hydrofluorocarbons (HFCs) starting as early as 2011.

"Climate change activists reacted sharply yesterday to indications from Senate Majority Leader Harry Reid (D-Nev.) that cap-and-trade legislation may have to wait until 2010, warning that the delay could derail international negotiations in Copenhagen."