"Tariffs can be lowered to grant special preference to climate-friendly goods, or they can be maintained at high levels to discourage trade in GHG- [greenhouse gas-] intensive goods and services." The working group says protectionism "in the service of climate change objectives" might virtuously "shelter domestic producers of climate-friendly goods." Furthermore, using "border carbon adjustment," a nation might virtuously "impose costs on imports equivalent to that [sic] faced by domestic producers" operating under a carbon tax. Or a nation with a cap-and-trade regime regulating carbon emissions by domestic manufacturers might require foreign manufacturers "to buy offsets at the border equal to that [sic] which the producer would have been forced to purchase had the good been produced domestically."
It's all about money.