I voted 'Don't know, but I think we should cut CO2, just in case'. I haven't read a vast amount on it, but I have read sufficient amounts to put me in the position of not accepting either side as providing a sufficiently robust argument. However, since I don't think that anyone knows for sure, I think that we should err on the side of caution and take reasonable steps.
The downside of doing nothing and being proven wrong is potentially too high to risk, IMHO.
This is slightly off topic, but related; I don't think that it will do us any harm to cut pollution generally either. When I used to come home after work in London, I would often have black snot (sorry for being vulgar) just from the pollution in the air; that can't be healthy. I certainly wouldn't bring up my children in a city if I could help it.
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