Tariffs are a hot topic these days. U.S. president-elect Donald Trump says he’s a “big believer in tariffs,” and has threatened a 25 per cent tariff on products from Canada and Mexico unless they curb the flow of drugs and migrants across the border.

Trump says tariffs are a “a powerful tool not only economically, but also for getting other things outside of economics.”

Could that include getting countries to cool the planet?