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"Wildlife biologists and climate scientists overwhelmingly agree that the disappearance of Arctic sea ice will lead to a sharp drop in polar bear populations. But some skeptics remain unconvinced, and they have managed to persuade the Canadian government not to take key steps to protect the animals."

"There is rising concern among polar bear biologists that the big recent summertime retreats of sea ice in the Arctic are already harming some populations of these seal-hunting predators."

"A new framework for reducing carbon emissions takes a crack at the knottiest dilemma confronting a global climate solution: how to divvy cuts between rich and poor nations."

"The Senate climate debate cranks up this week with a series of hearings and high-level meetings aimed at producing legislation that can be matched up with last month's House-passed bill."

Urban farmer Will Allen, half a mile from Milwaukee's biggest housing project, is different from others in the good-food movement.

Terry Tamminen, former environmental advisor to California's Gov. Schwarzenegger, is a key player on global climate change now.

The National Climatic Data Center in Asheville, NC, is playing a growing role in understanding weather and climate change.

"A plan to restore salmon runs on California's Sacramento River could help revive killer whale populations 700 miles to the north in Puget Sound."

"San Joaquin Valley farms are laying off workers and letting fields lie fallow as their water ration falls."

"TUCSON, Ariz. (AP) -- Long dependent on wellwater and supplies sent hundreds of miles by canal from the Colorado River, this desert city will soon harvest some of its 12 inches of annual rainfall to help bolster its water resources."