We know since many decades that a carbon price might be a good idea. But it's not that simple, because either you do it worldwide or you introduce lots of exceptions or you do something like carbon import tariffs (which the EU wants to do, but I think no such mechanism exists anywhere in the world right now).

Bottom line is: Most of the world has no carbon price, and the places that do have one (e.g. the EU ETS) there are so many loopholes that it is not very effective. It's not that it isn't worth trying to do better, but a carbon price is definitely not a short term solution.

So I'm inclined to think whoever proposes a carbon price as "the one true solution" really doesn't want a solution at all.