Matt Steinglass:

If there’s any reason for the US to fear the idea of border adjustments for carbon reductions, one would think the fear should be directed towards Europe and Japan, rather than China. If Europe and Japan get they idea that they could impose tariffs on US goods based on their much lower carbon emissions per dollar of GDP and the US’s vastly lower gas taxes, that might hurt US exports. But it would also be good for the planet.

Protectionism in any form is worrying.

We want to hear what you think about this article. Submit a letter to the editor or write to letters@theatlantic.com.