Close to 600 people died in British Columbia’s June 2021 heat wave. As it occurred during an abnormally low tide, billions of mussels, clams, sea stars and other invertebrates are believed to have perished. Some of the marine devastation was on Cortes and Quadra Islands. A new record for the hottest temperature ever recorded in Canada was set, but a new study from the University of Bristol found worse heat waves in other times and places.