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They (hopefully) recover the mercury to be reused in other bulbs. And guess what the coal that we burn to make electricity contains? Begins with 'm' ends with 'y' -- you save enough electricity using CFL's to more than offset the mercury contained in them. It is about 3mg per bulb.
1000Bulbs.com has stopped selling *all* dimmable CFL's -- I strongly suspect because they don't work very well. I have some, but we rarely dim 'em, so I think I just swap out the dimmers for switches...
Some LED's are not dimmable either.
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