Hunga Tonga-Hunga Ha’apai erupted on January 15, 2022, in the Pacific Kingdom of Tonga. Because it was an underwater volcano, Hunga Tonga produced little smoke, but a lot of water vapour: 100-150 million tonnes, or the equivalent of 60,000 Olympic swimming pools. In one, we assumed no volcano erupted, while in the other one we manually added the 60,000 Olympic …