EPA Administrator Lisa P. Jackson said the agency will look at new evidence in reconsidering the Bush-administration decision not to regulate perchlorate in drinking water.

"Psychological barriers like uncertainty, mistrust and denial keep most Americans from acting to fight climate change, a task force of the American Psychological Association said on Wednesday."

"In a matter of years or decades, researchers believe, animals and plants already are adapting to life in a warmer world. Some species will be unable to change quickly enough and will go extinct, but others will evolve, as natural selection enables them to carry on in an altered environment."

"Mexico aims to put a detailed offer to cut the growth of its own greenhouse gas emissions on the negotiating table at global climate change talks in Copenhagen this year, a senior environmental policymaker said."

"With the fight over health care reform absorbing all the bandwidth on Capitol Hill, Democrats fear a major climate change bill may be left on the cutting-room floor this year."

White roofs, a measure recently urged by Energy Secretary Steven Chu, are catching on both as a way of fighting global warming and a way to cool houses cheaply.

"Secretary General Ban ki-moon today announced plans to fly from Norway out over the Arctic Ocean to the Norwegian research vessel Lance near the North Pole on September 1. The planned excursion is part of his efforts to prod world leaders to take meaningful steps on global warming in treaty talks in Copenhagen in December."

"Is it possible that the long performance of the 'You first, sir,' vaudeville routine by the Alphonse and Gaston of the global greenhouse is drawing toward a close?"