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A presidential message turns cross-border wildfire smoke into an accountability fight, with big implications for diplomacy and risk planning.

The 50% jump moves fast, and it immediately raises costs, leverage, and negotiating stakes for companies trading across the border.

The clash over Canadian wildfire smoke is spilling into trade leverage and raising the temperature on U.S.-Canada relations.

New 50% duties hit some Canadian alcohol, autos, and dairy in 30 days, with key exemptions for energy and potash.