A pharmacy display shows a temperature of 42 degrees Celsius in Paris during a heat wave, Wednesday, July 29, 2026. (AP Photo/Aurelien Morissard).

A man walks on dried grass in a park, amid drought conditions in London, in London, Sunday, Aug. 9, 2026. (AP Photo/Kirsty Wigglesworth)

People walk on a sandbar underneath the Danube's Margareth Bridge in downtown Budapest, Hungary, Wednesday Aug. 5, 2026, as the river, which runs through 10 European countries, has receded never-before-seen low water levels. (AP Photo/Bela Szandelszky)

A Serbian Army helicopter battles a fire in Deliblatska Pescara (Deliblato Sands), near the village of Sumarak, 70 kilometers north-west of Belgrade, Serbia, Friday, Aug. 7, 2026. (AP Photo/Darko Vojinovic)

A firefighters helicopter battles a fire in Deliblatska Pescara (Deliblato Sands), near the village of Sumarak, 70 kilometers north-west of Belgrade, Serbia, Friday, Aug. 7, 2026. (AP Photo/Darko Vojinovic)

smoke emerges from a forest during a wildfire in Deliblatska Pescara (Deliblato Sands), near the village of Sumarak, 70 kilometers north-west of Belgrade, Serbia, Friday, Aug. 7, 2026. (AP Photo/Darko Vojinovic)

A boy cools himself off in a fountain on a hot summer day in Moscow, Thursday, Aug. 6, 2026. (AP Photo/Pavel Bednyakov)

Usually submerged areas of the Danube River are exposed amid exceptionally low water levels, in Rasova, Romania, Monday, Aug. 3 2026. (AP Photo/ Vadim Ghirda)