One of the "energy economics" aspects of natural gas is that it is very much more efficient (in terms of MegaWatts of power per ton of CO2 emissions) than coal. So, when energy economists look at this (at least the ones who think like my Dad) they tend to think that the easiest path forward is to replace as much of the coal burning plants with more efficient natural gas power plants....
I'm not talking just about the US, but world wide. It's tough to convince a country that is limited in economic power that burning coal is bad for that country. Especially when they don't have the economic strength to go solar or wind or nuclear.
When I talked to my Dad about this years ago (when he was in the process of writing a book about the subject), he specifically mentioned that the book did not intend to even mention nuclear. Except for maybe in the prologue where he and his co-author would discuss their intent and assumptions. Why? Because nuclear was so clearly an obvious solution. But, an obvious solution that had all kinds of other political implications outside of global warming. Not wanting refined nuclear materials (or even spent nuclear waste) to fall into the wrong hands, wide-spread opposition from environmentalists and such. That doesn't even mention the long lead time for nuclear (at least in the US). We're probably talking about 10 years of planning, environmental reports and such. Followed by another 5 or 10 years of construction and testing and such before it's fully operational. During that 15 or 20 years, the project is wide open to an assault from political opposition with party in control of congress, senate or presidency constantly changing.