Northern Canada is seeing record temperatures because of a heat dome hovering over the region and experts are worried the extreme heat will lead to a rapid permafrost thaw and potentially catastrophic effects.

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The National is CBC's flagship nightly news program, featuring the day's top stories with in-depth and original journalism, with hosts Adrienne Arsenault and Andrew Chang in Toronto, Ian Hanomansing in Vancouver and the CBC's chief political correspondent, Rosemary Barton in Ottawa.