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A quick guide to why the experts are saying this latest deep freeze isn't a reason to think we're safe from global warming.
Polar vortex strikes U.S. Midwest, causing 'life-threatening' cold
Polar Vortex The Canadian Encyclopedia
Polar vortex brings frigid weather to much of Canada — but relief is (almost) in sight - National
Flip the switch: Western Canada warms up as polar vortex shifts east - The Weather Network
Polar vortex: The science behind the cold
How does climate change affect the polar vortex?
A Polar Vortex Is Descending On Canada & Here's When 'Frigid Temperatures' Will Hit - Narcity
Polar vortex: What is the 2019 polar vortex weather event and is global warming to blame? - CBS News
Severe cold snap defies El Niño, brings extreme chill, snow to the Prairies - The Weather Network
Extreme cold warning smothers most of Alberta
Life-threatening cold freezes over the Prairies, colder than Arctic - The Weather Network
Will a 'polar vortex' impact this year's winter?
Is climate change affecting the polar vortex? » Yale Climate Connections
Environment Canada extends extreme cold weather warning into Saturday, but the polar vortex will be over soon
