Trump threatens new Canada tariffs over fires sending 'filthy' air into US cities

The briefing

Canadian leader Mark Carney says both the US and Canada have an equal responsibility to fight climate change, which experts say are worsening wildfire conditions

Why it matters

The force of this story is not in the headline but in the decisions it will force across the trump, threatens, canada, tariffs, fires landscape.

What sits behind it

The landscape around trump, threatens, canada, tariffs, fires has been shifting for some time, and BBC places this development within that longer trajectory.

Where this fits in Signal Ledger

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Our take

Signal Ledger reads this through the lens of trump, threatens, canada, tariffs, fires: Canadian leader Mark Carney says both the US and Canada have an equal responsibility to fight climate change, which experts say are worsening wildfire conditions.