120: Replace all your incandescent bulbs with CFLs by adam

Every time you complete this action, you will reduce emissions by an estimated 2158 lbs. CO₂e.

Compact fluorescent light bulbs (CFLs) last about 10 times longer than regular incandescent bulbs and consume 75% less electricity. Replacing one 75-watt incandescent with a 19-watt CFL can save $57.50 and 763 lbs of CO₂ over the life of the CFL. Seven CFLs save the emissions of a round-trip transatlantic flight.

CFLs do contain a small amount of mercury, so be sure to recycle them when they burn out.

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