As for the mercury, if you draw power from a coal plant as most Michiganders do, an incandescent bulb will result in the release and deposition of several times more mercury than an equivalent CFL bulb contains. Popular Mechanics has concluded that "Even if the mercury contained in a CFL was directly released into the atmosphere, an incandescent would still contribute 4.65 more milligrams of mercury into the environment over its lifetime."

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