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"The Environmental Protection Agency issued a new health standard on Thursday for sulfur dioxide emissions, the first such revision in nearly 40 years."

A computer simulation by the National Center for Atmospheric Research illustrates a scenario -- which some consider likely -- in which oil from the BP Gulf spill could spread as far north as Cape Hatteras by July.

Initial enthusiasm from electric utilities for the Kerry-Lieberman Senate climate bill has given way to lobbying silence -- which worries environmentalists hoping a last-ditch effort to pass it this year might succeed.

"BP, already bedeviled by an out-of-control well spewing millions of gallons of oil  into the Gulf of Mexico, now finds itself with one more problem: Tony Hayward, its gaffe-prone chief executive."

"At virtually every turn lately, the White House cannot shake the appearance that it is hamstrung and a step behind. From a major crisis such as the oil spill in the Gulf of Mexico to smaller and seemingly avoidable controversies over internal Democratic Party politics, President Obama and his team are on the defensive."

"The Interior Department denied Thursday that it has extended a drilling freeze to shallow waters of the Gulf of Mexico, contradicting an e-mail written earlier in the day by the Minerals Management Service's supervisor of field operations for the Gulf of Mexico."

"BP reported some oil was flowing up a pipe Friday from a cap it wrestled onto its broken Gulf of Mexico well but crude still spewed and it was unclear how much could be captured in the latest bid to tame the nation's worst oil spill."

"Hawaii Governor Linda Lingle today issued an executive order to establish surfing reserves at two of Hawaii's most important and well-known surfing areas. Both reserves are located in the state waters of the island of Oahu."

Tonight CNN completes its two-day special report, "Toxic America," detailing some of the ways Americans are exposed to toxic chemicals, their effects, and what can be done to reduce human exposure.

"If you're eating non-organic celery today, you may be ingesting 67 pesticides with it, according to a new report from the Environmental Working Group."