"One of the great mysteries about North America is what killed off woolly mammoths and other exotic animals that roamed the land after the last ice age. Ideas have ranged from a comet impact and climate change to human hunters. A study published Friday in Science Magazine provides new clues about this — cleverly deduced from samples of a fungus that grew on the animals' dung."

NIEHS Director Linda Birnbaum says she is concerned that as U.S. manufacturers shift away from toxic chemicals in consumer goods to alternative chemicals, "we kind of jump from the proverbial fry pan into the fire."

"U.S. EPA moved closer yesterday to finalizing new engine and fuel standards for the largest ocean-bound ships by sending the draft rules to the White House for review."

"The Obama administration on Wednesday announced plans to beef up federal strip-mining inspections and reviews of mining permits issued by state regulators like West Virginia's Department of Environmental Protection."

"Coal pollutants affect all major body organ systems and contribute to four of the five leading causes of mortality in the United States: heart disease, cancer, stroke, and chronic lower respiratory diseases, concludes a scathing report issued today by Physicians for Social Responsibility."

"The biggest influence groups for oil and coal spent a combined $115 million last year to burnish their images and shape public opinion on energy, expenditures that dwarf amounts they have previously reported for federal lobbying."

"No one would choose to eat polychlorinated biphenyls, or PCBs -- yet we unwittingly do. And a new study finds that the cost of their pervasive contamination of our food supply can be high blood pressure, a major risk factor for heart disease."

John M. Broder reports a feature-length profile of U.S. Chamber of Commerce president Thomas J. Donohue, whose legendary pugnacity has been focused on legislation to curb climate change.

"A solid majority of Americans recognize the need to help the environment, although there are some things -- like buying a hybrid car or taking mass transit -- that people often talk about, but don't necessarily act on."