"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."

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

"The U.S., European Union and 12 of the world's largest nations plan to embrace 'an aspirational goal' of reducing emissions of global-warming gases by 50% by 2050, according to a draft declaration by world leaders set for release next week in Italy."

"Proposals to impose 'carbon tariffs' on imported products will violate the rules of the World Trade Organization as well as the spirit of the Kyoto Protocol, China's Ministry of Commerce said."

If the United States wants to build a market-based approach to reducing carbon dioxide emissions, it should learn from Europe's failures.

"California can develop its own standards on greenhouse gas emissions from cars and trucks, though it agrees not to toughen the standards before 2017. Automakers agree to drop lawsuits."

"The House narrowly passed an ambitious climate bill [Friday] that would establish national limits on greenhouse gases, create a complex trading system for emission permits and provide incentives to alter how individuals and corporations use energy."