A carbon border tax is the only mechanism that actually stops emissions being outsourced to countries with looser rules. This should have happened a decade ago.
On theguardian.com — see it on the live page
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Agreed in principle, though the implementation risk is real — exporters in countries that had nothing to do with historical emissions could get hit hardest if there's no carve-out for development status.
Or, alternative read: this is protectionism with a green coat of paint. Rich countries get to keep their industries competitive by taxing everyone else's exports and calling it climate policy.