Zebra mussels, which have caused an estimated $5 billion in damage to the Great Lakes, have been found in a Maryland tributary of Chesapeake Bay. If they spread, they could threaten the less-salty waters of the Bay.

West Virginia's environmental agency says it's OK for fish there to contain more mercury than the federal EPA recommends -- because West Virginians consume less fish than the national average.

"The Obama administration has cleared more than three-dozen new mountaintop removal permits for issuance by the U.S. Army Corps of Engineers, drawing quick criticism from environmental groups"

A million year old cycle of fish migration almost came to an end in the waters off of the nation’s capital. But a monumental conservation effort has brought the American Shad them back from the brink.

President Obama issued an executive order empowering EPA to set a more demanding timetable for cleaning up the Chesapeake Bay and to penalize states that fail to meet it.

"INSTITUTE, W.Va. -- Bayer CropScience managers knew methyl isocyanate monitors were broken last August when they restarted a pesticide unit where up to 37,000 pounds of the deadly chemical are stored, company officials have confirmed."