Mercury is released from ores, minerals and fossil fuels into the atmosphere where it can circulate through out the world and accumulate in living organisms in the water and on land. These releases are through natural events or during human activities. Among the largest sources of mercury emissions in the U.S. are coal power plants and mining operations (especially gold mining). A potentially growing source of mercury is disposable products such as compact fluorescent light bulbs and electronic devices, which both contain mercury. The mercury eventually leaks into the atmosphere when the products are crushed in a landfill.
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