A silent killer lurks undetected in millions of homes across the United States, and winter is its peak season. Find out what you can do to stop it.

Each year, as many as 20 million people get sick from drinking contaminated water in the U.S.

Residents claim they have blood tests to prove exposure to an unsafe amount of heavy metals.

Doctors are seeing up to 15 times as many chronic deformities in infants.

Contaminated sites being used to house wind farms, solar arrays and geothermal power plants.

Vacationers are becoming wary of theme parks as the swine flu outbreak worsens.

Oil company provided tapes made by a drug trafficker in case against Ecuadorean peasants.

Coal-burning power plants are cleaning up the air, but it's at the expense of the nation’s waterways.

One of the cleanest places in your home may actually be one of the dirtiest, according to a study that suggests one in five showerheads spews out bacteria.