Actually, in a truely libertarian society, no one would give a shit about global warming, since the only person you should be looking out for is yourself, which includes saving money by purchasing the cheapest energy possible.
The solution would be for the libertarian feudal lords to build underground bunkers where they can live while the rest of the population dies, and then die themselves, alone.
Because we all know that global warming, if real, would resemble a nuclear war

Also, nice job ignoring my argument.