I don't know every carbon pricing scheme in the world, but I have never heard of any that would involve agricultural methane.
The EU ETS, which is not a carbon tax, but an emission trading system, but which is the largest carbon pricing scheme in the world, does not include methane at all. The EU has just decided that they want to start monitoring methane emissions, but that's about it. They have no plans right now to regulate or price methane emissions.
The EU ETS, which is not a carbon tax, but an emission trading system, but which is the largest carbon pricing scheme in the world, does not include methane at all. The EU has just decided that they want to start monitoring methane emissions, but that's about it. They have no plans right now to regulate or price methane emissions.