Greenland's ice sheet melted 17 times faster than average during May heatwave, according to a report released by World Weather Attribution (WWA). The data from May 15-21 heatwave was compared to average ice melt for the same week during the period 1980-2010. In eastern Greenland, the hottest day during the heatwave was about 3.9°C warmer compared to the preindustrial climate.