It turns out that the US is one of the few industrialized nations to meet the terms of the Kyoto protocols (reduce CO2 emissions to 1997 levels) despite the fact we never signed it or did anything to try to meet the goals.
Thank the recession and probably more importantly the natural gas and fracking revolution. Fracking will do more to reduce CO2 than the entire sum of government and renewable energy projects (since a BTU from natural gas produces about half the CO2 as a BTU form coal). Of course, environmentalists oppose fracking. They would rather carpet the desert with taxpayer-funded solar panels and windmills than allow the private sector to solve the problem using 50-year-old technology.