Even the snow-capped peaks of the Alps have not escaped the heat.
Ongoing measurements suggest this summer could become one of the worst ever recorded for melting Alpine glaciers, with more than a month of the season still to go.
After a mild winter, glaciers had less snow cover than usual at the end of April – and an unusually early heatwave the following month accelerated the melting of snow.
This exposed the ice beneath, leaving the glaciers vulnerable to melting faster in subsequent heatwaves.
As you can see below, satellite imagery suggests much of the front of Rhône Glacier in Switzerland has retreated by 50m (160ft) or more since the same time last year.