Wisconsin could become the first state in the country to force electric utilities to reduce the amount of mercury they put into the air. Coal-burning power plants are the largest single source of airborne mercury pollution. Mercury can cause brain damage and reproductive problems in fish, animals, and people. Mercury that lands in the water can build up in the food chain. People take in mercury when they eat fish. Wisconsin, Minnesota, and other Great Lakes states have fish advisories. They warn people not to eat too much fish caught in the region's lakes and rivers. Mainstreet Radio's Stephanie Hemphill reports.