When it comes to mercury, a little means a lot. It doesn’t take much mercury to pollute our local waterways. In fact, the mercury in one of the old-fashioned thermometers can contaminate nearly 4 tons of fish. Many common household items contain mercury—everything from fluorescent light bulbs to thermostats. But it’s easy to reduce mercury pollution: keep these products out of the trash. Find out how you can safely dispose of mercury containing products.