Scandinavian winters could be about to get a lot colder – and it all links back to a volcanic eruption that happened on the other side of the world in early 2022. In the coming years, it could bring ice cover back to the Baltic Sea at levels not seen in decades. When the Hunga Tonga-Hunga Ha’apai submarine volcano erupted in the South Pacific on 15 January 2022, a record 100-150 million tonnes of ocean water evaporated high into the stratosphere. This is the equivalent of 60,000 Olympic-sized swimming pools. Since then, it has been linked to the unusually large hole in the ozone layer seen in …