Bubbles from a scuba diver rise towards the surface in the waters near Porticcio, on France's Mediterranean island of Corsica, September 2, 2015. In it's July report, the U.S. National Oceanic and Atmospheric Administration (NOAA) said many countries and the world's oceans experienced heatwaves, with the Earth's oceans temperature also hitting record highs, several months before world leaders seek to reach a climate agreement when Paris hosts the World Climate Summit, called the COP21, from November 30 to December 11, 2015. REUTERS/John Schults