It may result in a worthwhile cleaning up of the air we breathe, but CO2 at current levels is harmless and may even be below optimal. Even though the science is completely wrong, there may be some benefits, but probably the price will be way higher than if we had got the science right in the first place. This whole business will eventually give science a black eye. That's sad considering that most of the real experts in this area of science have actually got it right. What they are saying is that we haven't got to the point where we can accurately model climate, and we don't have any evidence that increasing atmospheric CO2 is causing warming, regardless of whether the Earth is warming or not. All our best evidence is telling us that rising CO2 is due to a combination of temperature and man's activities. But there is no observable evidence that the increase of a few molecules of CO2 per ten-thousand is having any measurable affect on our Earths temperature.
This isn't by any means the first time these things have happened. A few other examples, I'm sure there are others, would be the Lysenko affair, the Polywater nonsense, and the Eugenics movement of the early Twentieth Century. This will be another, and James Hansen will be the goat this time. At least he will be a deserving goat.