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With sales of CFLs now reaching about 400 million a year in the United States, according to the federal EPA, concerns over the mercury has grown because many of the lights end up in landfills. California and several other states ban disposal of CFLs in the trash because they could contaminate landfills. But there's little enforcement. Environmental groups such as the Natural Resources Defense Council have taken a close look at the CFL safety issue and have concluded that the energy savings exceed the dangers posed by the mercury the lights contain.
7/13 San Jose Mercury News