Global Warming: A Scientific Canard?

I am not sure if I believe all the dire predications or not, but seeing that the scientific community can't figure out what is going on I am going to hold off on take a side. Although I admit the Earth is getting warming, I wonder if this is simply a geological fluxuation rather than a permant man made symptom.

Global warming may not be as dramatic as some scientists have predicted.

Using temperature readings from the past 100 years, 1,000 computer simulations and the evidence left in ancient tree rings, Duke University scientists announced yesterday that "the magnitude of future global warming will likely fall well short of current highest predictions."