"About 4 million barrels of spilled oil, as much as BP's Gulf of Mexico spill, is flowing into the Arctic Ocean every year, Greenpeace says."

"National parks from the Sierra Nevada to the Great Smoky Mountains are increasingly being fertilized by unwanted nutrients drifting through the air from agricultural operations, putting some of the country’s most treasured natural landscapes at risk of ecological damage, a new study has found."

"TOLEDO, Ohio -- Toxins from blobs of algae on western Lake Erie are infiltrating water treatment plants along the shoreline, forcing cities to spend a lot more money to make sure their drinking water is safe."

"INCHELIUM, Wash. -- Imagine bringing your kids to the lake and wondering if they’d be better off at home, watching TV."

"BALTIMORE -- Even as some Fells Point residents worry that building over a capped toxic site at Harbor Point could endanger their health, records show elevated levels of cancer-causing chromium in groundwater just beyond the area targeted for an upscale development."

"The handling of an oil spill in North Dakota is raising questions, after a state agency waited to tell the public it had taken place. A wheat farmer was the first to recognize the spill had happened; it became public knowledge nearly two weeks later."

"South of Florida's Lake Okeechobee, hundreds of thousands of acres of sugar cane thrive in the heart of one of the world's largest wetlands. The Everglades stretches from the tip of the peninsula to central Florida, north of Lake Okeechobee."

"Along major roadways that connect the sprawling limits of San Diego County, 39 schools lie within 500 feet of smog-filled traffic corridors, a distance that air-pollution researchers believe significantly increases the risk of pediatric asthma and other respiratory illnesses."

"A Tesoro Logistics LP pipeline has spilled more than 20,000 barrels of crude oil into a North Dakota wheat field, the biggest leak in the state since it became a major U.S. producer."