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What do you buy when you buy a carbon offset? Susan Hess follows the $4.50 she paid to offset the CO2 emitted for a train trip to Seattle in Gorge Outdoors, July 24, 2009.

What will happen to all the "clunkers" traded in for gas-sipping new cars under a new federal rebate program?

"In an interview with Yale Environment 360, John Kerry praises the carbon cap-and-trade legislation now being debated in the U.S. Senate, describes its importance to upcoming climate talks in Copenhagen, and explains how he plans to help the landmark legislation clear the Senate and become law."

"The 'dead zone' in the Gulf of Mexico, an area choked by low oxygen levels that threatens marine life, is smaller than expected this year but more deadly, the government said on Monday."

The indigenous Kamayura tribe in Brazil's rain forest are losing their traditional source of food. The fish are disappearing from their lake as the Amazon region region is made hotter and drier by deforestation -- and some say by climate change.

"More than two million people living on the banks of Lake Kivu in central Africa are at risk of being asphyxiated by gases building up beneath its surface, scientists have warned."

"More than 20,000 old oil and gas wells across [Alberta] have been sitting abandoned or inactive for more than a decade without being cleaned up, worrying landowners and environmentalists who say the sites unnecessarily eat up and possibly contaminate valuable farm land."

Homes are "contaminated with potentially dangerous levels of uranium from the days of the cold war, when hundreds of uranium mines dotted the vast tribal land known as the Navajo Nation."

"Hazardous 3M trash buried decades ago in Washington County is being dug up and will be reburied with a protective lining."

"The Senate [Monday began debate] on a $34.3 billion fiscal 2010 energy and water spending bill as environmental groups press lawmakers to strip provisions they say will damage wetlands and fish habitat in Missouri."