"None of the five witnesses called to testify will appear at Wednesday’s hearing of the U.S. Coast Guard-Interior Department probe into what caused the Deepwater Horizon oil rig to explode."

"It's simply known as 'the wall,' a steel-and-concrete structure costing about $22 million that will be pounded deep into the floor of the Elizabeth River near one of the worst toxic-waste sites in Hampton Roads."

"The EPA says some communities in Louisiana face a 'moderate health risk' due to hydrocarbon fumes from the Gulf oil spill. Researchers will report air quality findings this week."

"A top BP official aboard the oil rig that exploded in the Gulf of Mexico in April was expected to refuse to speak at a federal hearing Tuesday."

"Five Great Lakes states filed a lawsuit in federal court Monday to try to block Asian carp from entering Lake Michigan, the third attempt to seek the closing of Chicago-area shipping locks through the court system."

"The Great Lakes are feeling the heat from climate change. As the world's largest freshwater system warms, it is poised to systematically alter life for local wildlife and the tribes that depend on it, according to regional experts."

"The Obama administration has released a new analysis of chemical monitoring performed by BP PLC in order to tamp down concerns that offshore responders battling the oil giant's Gulf of Mexico gusher have been exposed to a chemical linked to lingering health problems among cleanup workers long after the 1989 Exxon Valdez spill."

"The Obama administration on Monday announced a new national policy for strengthening the way the U.S. manages its oceans and coasts, and the Great Lakes."