Police in the Vancouver area have responded to more than 130 sudden deaths since Friday. Most were elderly or had underlying health conditions, with heat often a contributing factor.
Canada broke its temperature record for a third straight day on Tuesday - 49.6C (121.3F) in Lytton, British Columbia.
The US north-west has also seen record highs - and a number of fatalities.
Experts say climate change is expected to increase the frequency of extreme weather events, such as heatwaves. However, linking any single event to global warming is complicated....BBC
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