French geochemist at the IRD (Institute of Research and Development), Cyril Marchand (C), beside PhD students, works on June 28, 2016 in Mont-Dore, near Noumea, next to mangrove plants installed in a greenhouse which recreates the weather conditions similar to what is forecast for the end of the century, to study greenhouse gas. / AFP PHOTO / Fred PayetFRED PAYET/AFP/Getty Images

A picture taken on June 28, 2016 in Mont-Dore, near Noumea, shows mangrove plants installed in a greenhouse which recreates the weather conditions similar to what is forecast for the end of the century, to study greenhouse gas. / AFP PHOTO / Fred PayetFRED PAYET/AFP/Getty Images

BERLIN, GERMANY - JUNE 28: German Chancellor Angela Merkel listens to debates after she addressed the Bundestag with a government declaration on the recent Brexit vote on June 28, 2016 in Berlin, Germany. European leaders are scheduled to meet at a summit in Brussels later today to discuss the consequences of the British vote to leave the European Union. Merkel called the vote an unprecedented event in EU history but one the remaining 27 member states will weather. (Photo by Sean Gallup/Getty Images) *** BESTPIX ***

A man paddles on a board at lake Ammersee near the small Bavarian village Utting, southern Germany, on June 28, 2016. Meteorologists forecast a warm and sunny weather during the next days for the southern German region. / AFP PHOTO / CHRISTOF STACHECHRISTOF STACHE/AFP/Getty Images

Swans swim at the water of the lake Ammersee near the small Bavarian village Utting, southern Germany, during nice summer weather with temperatures by 20 degrees on June 28, 2016. Meteorologists forecast a warm and sunny weather during the next days for the southern German region. / AFP PHOTO / CHRISTOF STACHECHRISTOF STACHE/AFP/Getty Images

BERLIN, GERMANY - JUNE 28: German Chancellor Angela Merkel listens to debates after she addressed the Bundestag with a government declaration on the recent Brexit vote on June 28, 2016 in Berlin, Germany. European leaders are scheduled to meet at a summit in Brussels later today to discuss the consequences of the British vote to leave the European Union. Merkel called the vote an unprecedented event in EU history but one the remaining 27 member states will weather. (Photo by Sean Gallup/Getty Images)

Under-construction towers are seen covered in clouds during rain showers in Mumbai on June 28, 2016. Annual monsoon rains have progressed to most parts of western and central India, easing fears of millions of desperate farmers after two straight years of drought, the weather department said. / AFP PHOTO / PUNIT PARANJPEPUNIT PARANJPE/AFP/Getty Images

Indian girl children sort through roses for sale during rain showers in Mumbai on June 28, 2016. Annual monsoon rains have progressed to most parts of western and central India, easing fears of millions of desperate farmers after two straight years of drought, the weather department said. / AFP PHOTO / PUNIT PARANJPEPUNIT PARANJPE/AFP/Getty Images