A good point, but climate change isn't an isolated issue. Most CO2 measures also address the issue of how we're going to supply resources to our universally-acknowledged overpopulation problem - increased efficiencies, alternate fuels, so on and so forth. Most of them provide benefits outside the climate change arena.
As I said in my post upthread, I agree that there are plenty of good reasons to reduce fossil fuel use regardless of where one stands on climate change; if we'd been smart we'd have made eliminating dependence on Middle Eastern oil a national priority in the 1970's.
This assumes that reducing CO2 emissions is in fact a partial solution. It may not be; it may, on net, make things worse, because the cost of making the reductions may be greater than the expected benefits.