>It could change something if we forced them to compete on how much of CO2 they emit for MWh.

A carbon tax basically does this but at an economy-wide level, and allows us to play off fossil fuel companies against EV companies, rather than just playing off Shell vs BP, for instance.

The problem is that large, strong companies can force regulators to issue as many allowances as they need. When companies are smaller the competition makes this kind of lobbying harder. So the fact that global emmisions have such consolidated source is important and alarming.