"When presidents and prime ministers departed the U.N. climate conference in Copenhagen last month, they left behind a vast legal tangle that experts have barely begun to unravel."

"The Obama administration may issue an order that would expand the National Environmental Policy Act's scope to prevent global warming. The move could open up new avenues to challenge projects."

Despite a 60-vote Democrat majority, climate change legislation faces an uphill fight in the Senate. Are more offshore drilling and subsidies for nuclear plants the key?

"Anywhere that people can go online they can trace the proposals and plans of countries to combat climate change through an online climate pledge tracker website newly established by the United Nations Environment Programme."

"Here's an opportunity to wisely spend some of the $100 billion that Secretary of State Hillary Clinton promised at Copenhagen to cut the greenhouse gases of developing nations by aiding in the development of renewable energy infrastructure to by-pass fossil fuel dependence."

"Earth's various ecosystems, with all their plants and animals, will need to shift about a quarter-mile per year on average to keep pace with global climate change, scientists said in a study released on Wednesday."

"Quebec will become the first province in Canada to adopt California's strict auto emissions standards, the province's environment ministry said on Tuesday."

"China on Friday defended the role played by premier Wen Jiabao at climate change talks in Copenhagen this month after a barrage of international criticism blaming China for obstructing negotiations."