[AnthonyMouse]

This is not really specific to a carbon tax though, is it? If the EU is using a cap and trade system or what have you, it still happens, because it's a problem of evaluating what is going on in someone else's jurisdiction.

My suggestion in another thread is to impose general tariffs on countries that don't have their own carbon tax, which, if it successfully pressures them to adopt one, avoids these kinds of games because now the high-emitting country charges the carbon tax itself regardless of whether its exports make a pitstop in Greenland, which it may do even if some of its exports were avoiding the tariff that way, so that all of them can avoid it.

But it's not obvious this is even necessary because if the largest economies (especially the US) did this, it would shift the economies of scale in favor of non-carbon energy sources to such an extent that they would become cost competitive on their own nearly everywhere else in the world anyway.

[cogman10]

Fair point. There likely needs to be somewhat of a critical mass before it becomes super effective. This might be something that could be accomplished with an international treaty.