Canada is in the grip of heatwaves and bushfires - climate science can explain why | 7.30

The Pacific northwest region of the USA and Canada are in the grip of a ferocious heat wave, bringing record-breaking temperatures up to 30 degrees above the norm. The temperatures have led to multiple bushfires burning across the Canadian province of British Columbia destroying multiple towns in their wake.

Dr Kristina Dahl is a senior climate scientist at the Union of Concerned Scientists, in San Francisco and she explains the climate science behind these extreme weather events.

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