...I went ahead and swapped out several more incandescent bulbs today with Energy Star CFLs.
I've swapped out perhaps a total of 14 bulbs so far. That's about 7000 pounds of C02 eliminated overall and a savings of over $100/year in electricity cost.
I keep incandescents for just a few places where I want the warmer color light (my lamp beside by bed) or where I have them on a dimmer switch (the dining room lights). I find that in some cases, the whiter color CFL is preferable, such as on my office desk lamp. The whiter light improves contrast on things I'm working on at my desk.
If every American home replaced just one light bulb with an ENERGY STAR qualified compact fluorescent light bulb, we would save enough energy to light more than 3 million homes for a year, more than $600 million in annual energy costs, and prevent greenhouse gases equivalent to the emissions of more than 800,000 cars.
If the only thing that the Live Earth concerts do is to help encourage/inspire a million light bulbs to be swapped out, then the energy expense to stage the concerts will have been well worth it. If the concerts help develop momentum for a broader shift in worldwide attitudes about climate change and energy conservation, then the energy used to stage the event will be a drop in the bucket compared to the impact it will have had down the road.