Replacing just one incandescent bulb with a compact fluorescent lightbulb (CFL) will make a big difference, especially if everyone did that. It would reduce carbon emissions equivalent to taking 1.3 million cars off the road, or not burning 29,900 railcars of coal.1 The impact on the environment is unbelievable. You can't make a better economic investment for your home. Replacing one bulb is estimated to save you $66 over the lifetime of the CFL. I replaced three bulbs with CFLs last year.2 I'll replace another six this month. I hope you join me.