"BP Plc on Tuesday began cleaning up an oil spill from a leaky Alaskan pipeline, but said it has not determined what caused the leak or how much material spilled onto the snow-covered tundra."

Environmental groups have issued a new report listing top U.S. species threatened by climate change.

"An El Nino weather pattern warming the Pacific Ocean and linked to drought in South Asia is likely to continue through the first quarter of 2010, the World Meteorological Organization (WMO) said on Tuesday."

"The Environmental Protection Agency has put off, until the middle of next year, any decision about whether to increase the amount of ethanol allowed into the nation’s fuel."

"A scientist who is one of the central figures in the uproar over pirated e-mails from the University of East Anglia's Climate Research Unit announced Tuesday that he is stepping down as the unit's director while the university investigates the incident."

"If the evidence is overwhelming that man-made climate change is already upon us and set to wreak planetary havoc, why do so many people refuse to believe it?" Psychologists say denial of reality is a common human reaction to unpleasant truth.

"The U.S. Supreme Court hears a major property rights case Wednesday, a case from Florida that pits the state's need to prevent beach erosion against the rights of property owners to keep ownership of the land at the water's edge."

A USA TODAY probe reveals some of the reason why USDA officials did not recall meat they knew could be tainted with salmonella from school lunch programs. The story is based on documents obtained under the Freedom of Information Act.

"Most world leaders plan to attend a climate summit in Copenhagen this month, boosting chances that a new U.N. deal to fight climate change will be reached, host Denmark said on Tuesday."

"Climate change dominated the meeting of Commonwealth heads of government that concluded Sunday in Port of Spain with a statement of support for an international legally binding agreement in Copenhagen next month."