Tariffs have been applied over the years to protect homegrown industries and target competitors who are seen as using unfair trade practices. They impose costs on both importers and exporters and had been in decline until the recent U.S.-China trade war.

The Green New Deal has motivated those who want the United States to undertake unprecedented climate action, but it has also drawn backlash. How is the rest of the world grappling with decarbonizatio…