As drought spread and wildfires raged across Europe this summer, the extraordinary heat didn't stop at the shoreline. European waters notched their hottest summer months since satellite sensors began providing reliable data in 1982, according to a Reuters analysis of temperatures recorded at the seas’ surface. Scientists warn that events like this year’s marine heatwaves are becoming more frequent, more intense and more widespread as greenhouse-gas emissions drive up atmospheric temperatures around the globe. The world’s oceans absorb the majority of the excess heat and retain it longer than the land or atmosphere ↧ How Europe’s intensifying marine heatwaves threaten its fisheries As drought spread and wildfires raged across Europe this summer, the extraordinary heat didn't stop at the shoreline.