"Marsh grasses are the tough guys of the plant world. Left alone, they dominate coastal marshes from Texas to Newfoundland. Burn their stems and leaves, and they come back bushier than ever. They help slow down hurricanes and filter pollution. As impenetrable to humans as a green wall, they shelter birds, fish and endangered mammals, and act as nurseries for commercial species like shrimp and crabs. But let oil get into their roots and underground reproductive systems, and they can wither and die."

"Up to 4 million barrels (167 million gallons), the vast majority of the spill, remains unaccounted for in government statistics."

"Despite their tiny size, plant plankton found in the world's oceans  are crucial to much of life on Earth. They are the foundation of the bountiful marine food web, produce half the world's oxygen and suck up harmful carbon dioxide. And they are declining sharply."

"The icy Arctic waters around Norway's archipelago of Svalbard may seem pristine and clear, but like the rest of the world's oceans they are facing the threat of growing acidity."

"It's ... difficult to get an absolute answer about just what is, or isn't, in Delaware's water -- difficult enough that some real estate agents routinely suggest water-filter installations even in the absence of known problems."

"A federal judge on Wednesday stopped companies from developing oil and gas wells on billions of dollars in leases off Alaska's northwest coast, saying the federal government failed to follow environmental law before it sold the drilling rights."

"Each year, around a half a million people go whitewater rafting in Colorado, and the industry is a key economic driver in many rural towns. But in recent months, the issue of rafting and who can float through stretches of private property has divided the state."

"One out of three U.S. counties is facing a greater risk of water shortages by mid-century due to global warming, finds a new report by Tetra Tech for the Natural Resources Defense Council."

"Gov. Charlie Crist and legislative leaders took turns Tuesday blasting each other for the ill-fated special session he called to get a constitutional amendment on November’s ballot to ban offshore oil-drilling in Florida waters."

"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."