Another point these people never make is that Carbon Dioxide is a fertilizer for plants. They must have it in order to grow. This in turn leads to more, not less, life on Earth. Carbon Dioxide emissions are therefore GOOD for the environment, not bad.
That's probably another reason liberals want to ban it. Liberals don't want to admit that it's possible to achieve a world where their economic theories don't hold water (liberal theories only hold for subsistence-level economies). Thus, they need to cripple all production to make the world fit their mold.
(nb: to those infected with Liberal Mind Fog, when the real world disagrees with their understanding, that implies that the world, rather than their understanding, is mistaken)