Contaminates

This pollution, known as acid mine drainage, contaminates roughly 4,000 kilometers (2,500 miles) of West Virginia waterways. It's a legacy of more than a century of coal mining in the region.

In 2004, U.S. government food and environment regulators cautioned pregnant women not to eat more than 340 grams or 12 ounces of fish a week, the amount in two normal servings. The aim was to reduce their exposure to mercury, which contaminates fish worldwide.

The famous environmental principle says, "Whoever contaminates, pays."