If the Supreme Court upholds President Donald Trump's sweeping emergency tariff powers, a future president could slap huge tariffs on gas-powered cars and other goods that emit carbon.

That's not speculation. It's the conclusion of the Trump administration's own attorney during Wednesday's oral argument at the Supreme Court.

Trump has invoked the International Emergency Economic Powers Act (IEEPA) to impose tariffs on nearly all imports into the United States—even though the law has never been used for tariffs before. The "emergency" that underpins the tariffs is twofold. Some of the tariffs (those on goods from Canada, Mexico, and China) have been imposed as part of an attempt to counter the flow of fentanyl into the United States, while other tariffs are the White House's response to t

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