Thank you for information, switching to gas would explain a lot.
I wonder whether this switch was caused by a policy (gas is "green") or economy (gas is cheaper). If the latter (which I suspect is true), this is still a side-effect of the economical situation, not a conscious decision.
Coal is widely available in countries like Germany or China, while USA has pretty much every resource you can think of. Basing local economy on what is most economically viable is capitalism rather than eco-friendliness. Good example is fracking, less CO2 but much more toxic substances in the ground.
By pushing against coal some countries also try to enforce a different thing on the other countries - when those limit using coal, they need to import gas (or other resources) from somewhere, at higher price than coal. Money flows elsewhere. Increasing gas consumption in Europe is just a tad difficult in current situation with Russia, which doesn't help with reductions.
Again, I suspect Obama is more motivated by economical implications rather than "eco".
Pity that atomic energy has earned such a bad label.