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Here's what I think. There's a lot of uncertainty about the existence of global warming as well as what causes it, if it does exist. In addition, there is a lot of risk involved -- if it is indeed real and caused by humans, it could have substantial effects on people a few generations from now (flooded cities, etc.).
Considering that the technology now exists to meet our energy needs without burning lots of fossil fuels, is it not in our best interest to promote its use? By the time we know for sure what's going on, it may be too late to take action.
Global warming might not be real, but I think there's enough evidence and enough risk involved to justify working to phase out fossil fuels anyway.
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