We would never agree on a global tax system in the first place. We could tax wars for example, and those kill humans directly, unlike climate change. But we don

We would never agree on a global tax system in the first place. We could tax wars for example, and those kill humans directly, unlike climate change. But we don't do it, because many humans benefit from wars. Same with carbon tax, too many countries benefit from not paying it and so they won't. Second problem is that carbon tax won't help. It doesn't reduce emissions much (because realistically countries would rather pay than de-industrialize in short term), and it doesn't remove CO2 from the atmosphere at all. As I wrote above - a slow down of emissions won't really change the final outcome, it will only prolong the heating process.