There's been a bit of talk about the USA's recent 'polar vortex', but what is it? How does it work? And why does climate change (surprisingly) contribute to making parts of the USA so cold? This video explains it.
It seems this is one of the reasons that people say 'climate change' rather than 'global warming'. It's not just about a bit of heat. It's about more storms, floods, heatwaves - and in this case, the even occasional cold snap in isolated areas for a short time.
However, leaving the cold snap aside, temperatures year-round and worldwide are still getting warmer.
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