I put natural gas as #2 mostly as a hedge against just replacing coal with NG. As for moving transportation to electrical propulsion, the real effect has to be

I put natural gas as #2 mostly as a hedge against just replacing coal with NG. As for moving transportation to electrical propulsion, the real effect has to be judged by the marginal effect it has on emissions. If the marginal change is covered by coal, the benefit is much smaller than if the marginal change is covered by clean sources.