And, in the Beginning, Mr. Green Created Mathematics

Hey Mr. Green,
It seems you've done some creative mathematics in your discussion of CFLs. If incandescent bulbs are responsible for 1.2 tons of mercury emissions annually and the use of CFLs would reduce that by 0.9 tons, that still leaves 0.3 tons of emissions. When added to the 4 tons of mercury in the bulbs, that makes 4.3 tons of mercury. --Ed in Bellefonte, Pennsylvania

Yes, you're right, and I don't have anybody to blame for my lapse in logic, which is rather painful. The total maximum mercury release caused by fluorescents would be 4.3 tons, not 3.1.
Environmentally,
Mr. Green