The Met Office says "substantial" changes in working practices and daily routines will be required and there is a high risk of failure of heat-sensitive systems and equipment.
Twenty warmest years "all in the last 22," scientists say in a UN report, with weather extremes in 2018 including wildfires in California and Greece, drought in South Africa and floods in Kerala, India.
Airports were closed, a ferry ran aground and traffic authorities reported incidents "all over the place". Britain has not seen this amount of snow since 2013.
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