It's a legitimate concern; but the majority of carbon-producing activity is on the production side, and can be taxed from the producer, or even as a "carbon TCO

It's a legitimate concern; but the majority of carbon-producing activity is on the production side, and can be taxed from the producer, or even as a "carbon TCO" VAT on the consumption side. While tax dodges are a risk (particularly in the open, as big corps lobby for exceptions), this makes it much more universal than something like tax havens for capital gains by a small number of the uber-wealthy. I would consider the world-wide implications to be a bigger concern: if the tax is too high, some producers might feel incentivized to move operations to a country without a carbon tax. Though I generally think tariffs are a bad idea, a carbon tariff that essentially covers the difference (and goes to the same dividend pool) might not be the worst idea.