Abandoned gas stations dot some Florida highways. Economic conditions bear part of the blame. But operators' inability to pay for replacement of old, leaky tanks ironically may be causing more old tanks to be left in the ground.

"Oyster larvae have been dying by the billions. Scientists suspect it's a sign that carbon dioxide is dramatically affecting the ocean -- and if they're right, it could push Washington into the center of the debate about the future of the seas."

"The largest, deepest and coldest Great Lake holds another distinction -- the highest levels of the contaminant toxaphene in the region and possibly anywhere in the world."

A National Research Council report says it may be impossible to know whether contaminated drinking water at the Camp Lejeune Marine base caused birth defects and illness among people seeking $33.9 billion in claims.

If the Army Corps of Engineers and private companies used all the mud they dredge from wetlands and waterway to rebuild Louisiana coastal marshes, it would be a boon for coastal restoration.

"The air across Iowa is so polluted that the state is perilously close to violating new federal limits aimed at protecting human health."

"A dispute is heating up over the role of farms and forests in climate legislation."

"The Obama administration gave conditional support today for a federal-industry partnership that would build an advanced coal-burning power plant in Illinois to trap and store carbon dioxide emissions, reversing a Bush-era decision to abandon the FutureGen project."

"Dozens of communities nationwide are at risk from a coal ash spill like the one that blanketed a Tennessee neighborhood last year, but the Obama administration has decided not to tell the public about it because of the danger of a terrorist attack."