Yes but they also say it's the only policy you should use. But no government is ever satisfied just with a carbon tax. They always add in subsidies, regulations, rules, standards and all sorts of other stuff the experts say they're not supposed to do if they really accept the logic of the carbon pricing theory. So we end up with taxes and rules, the worst of both worlds. And even if they just stuck with a carbon tax, the best it will do is reduce carbon emissions a little bit. It won't "tackle climate change" because it can never be done on a big enough scale.