Are warmenistas really CFC deniers?

Bookworm Room has up an interesting post about global warming, CO₂, and CFCs.   Qing-Bin Lu, a professor of physics, astronomy, biology, and chemistry at the University of Waterloo, contends that temperature trends don't track CO₂ levels at all well when solar input is eliminated, but they do track CFC levels wonderfully.  Bookworm's readers engage in a spirited discussion of whether CFC emissions used to be a manmade problem that has now largely been solved, since CFCs were largely replaced by new refrigerants by 1989 treaty), or whether human contributions never were that large in comparison with natural sources to begin with.