This 2010 article by Raymond Pierrehumbert ( @ClimateBook), the Halley Professorship of Physics at @UniofOxford is full of great info. In it he argues why we desperately need to focus on CO2 emissions. He sums it up nicely in the last paragraph:

http://www.realclimate.org/index.php/archives/2010/12/losing-time-not-buying-time/

1/

There isn’t a single metric that perfectly captures the climate impacts of all greenhouse gases. Though it would be nice, our attempts to do so are misleading us and driving us to focus climate efforts on gases that will have an overall minimal effect on global temperatures.

2/

If there is a desire for a single, hand-dandy way to measure GHGs, we should ensure that it describes actual warming (e.g., GWP*) and not just CO2 equivalence (i.e. GWP).

3/

CO2 emissions are only rising right now, and if we don’t halt them, warming will continue. Focusing on other pollutants can be a worthy endeavor, but not at the expense of reducing CO2.

4/4