While compact fluorescent light bulbs (CFLs) are great when it comes to saving energy, they do contain a small amount of mercury and need to be disposed of safely. Here's some tips for disposing of CFLs without trashing the environment:
1. Check to see if your current garbage service recycles CFLs.
2. Retail stores like IKEA and Home Depot offer a free CFL take-back program.
3. Check to find local recycling at Earth911.org
If you want to avoid the mercury in CFLs check out LED light bulbs. LED light bulbs are shatterproof, run cool to the touch, and contain no mercury or hazardous substances and while they will last longer than CFLs they are currently much more expensive starting at $25 a bulb. Hopefully as the technology improves on LEDs the price will decrease.