Polar vortex: Fire used to melt ice on Chicago train tracks - BBC News

1. Polar vortex: Fire used to melt ice on Chicago train tracks  BBC News
2. What Is A Polar Vortex? Your Freezing Cold Questions Answered  NPR
3. Road chaos in US Midwest as biting polar vortex brings -50C | ITV News  ITV News
4. How polar vortex blasts are tied to global warming  EarthSky
5. How to Help the Homeless During the Polar Vortex  Lifehacker
6. View full coverage on Google News

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