Some comments
--As far as CO2 goes, there isn't much difference between burning coal than oil. For electrical power, nuclear is best, with decentralized local solar picking up as much slack as possible over the coming years. Centralized solar power plants aren't going to be able carry much of the load.
--Barring coal-gasoline conversion, our current transportation system (a major source of CO2) isn't going to be using coal. Until we move to more electric cars and trucks, it isn't going to be using nuclear, either.