The liberals and enviro nazis would never allow any market based solutions anyway. Their whole way of thinking is totalitarian; they will decide what must be done, and then force us to do what they deem necessary to deal with this alleged problem.
The whole purpose of the scheme is to form a one world government under the UN.
Controlling carbon fuels is the means.
The only way to reduce CO2 emissions so as to head off Global Warming is to do it on a world scale. The only way to do that is to have an organization that controls carbon fuels on a world scale.
Who is the natural choice to do that: The United Nations.
The UN is seeking to be the One World Government by a number of different paths. Another ins the Law of the Seas Treaty.