They don't have to consent. That's the whole point of tariffs. They can be imposed unilaterally (As we have recently seen with the US - China shoving contest. Which, of course, had nothing to do with the environment, or carbon emissions, and everything to do with political optics.)

The US can impose tariffs on trade with the US.

If they wanted to impose it on China's oil trade with Saudi or Russia, it would have to be done militarily.

And that still leaves the question how to impose a carbon tax on China's domestic coal and oil.

The purpose of carbon tarrifs is not to punish other countries.

The purpose of carbon tarrifs is to make foreign dirty-energy-intensive products less competitive, compared to less dirty-energy-intensive ones.

Because we already have a way of making domestic dirty-energy-intensive products less competitive. It works great. It's called a domestic carbon tax.

They remove the immediate complaint of "If we impose a local carbon tax on energy, foreign imports will outcompete us, because they don't have to pay it."

OP talked about a carbon tax, as am I.

You're talking about "carbon tarrifs", which I've never heard of, and don't know what they are.

A carbon tariff is a carbon tax, but on external goods, that come from countries which don't have carbon taxes of their own.

A tariff is generally across the board though, by product type. If one company starts being more "green" than the others in the country of origin, it doesn't generally get hit less by tariffs.

It can be implemented on a per-company basis, just as sanctions often are.

If the West stops trading with China then they will invade Taiwan and Okinawa and also supply modern weapon systems to North Korea.

This is Tom Clancy fairy-tale nonsense. China wants a nuclear-free Korea, for the same reason that the United States wants a nuclear-free Mexico and Canada. Nuclear super-powers aren't keen on letting their neighboring satellite states limit their foreign policy, by arming them.

A carbon tax is not 'stopping trade'. It's an increase to the price of goods that are energy-intensive to manufacture, or ship.

The Chinese aren't going to allow any sort of tariffs that would threaten their rapid industrialization without serious saber-rattling.

They'll do that regardless when the time is right.

This is pure speculation. Meanwhile, our government is actively invading and occupying how many countries?

0?