Long-threatened tariffs from U.S. President Donald Trump have plunged the country into a trade war abroad — all while on-again, off-again new levies continue to escalate uncertainty.

But, at the same time, no option is off the table—including restrictions on energy and natural resources. Because of the highly-linked energy systems of the two countries, such a move could wreak significant havoc on the U.

Despite emerging risks concerning U.S. domestic potash prices due to trade tensions with Canada, the rising costs of N-based fertilizers present a more immediate threat to U.S. agriculture, as these are closely linked to elevated domestic natural gas prices,