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

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A paddle boat in Lake Mead near the Hoover Dam, far below the bathtub ring of light minerals indicating the lack of water, near Boulder City, Nev., on Friday, Aug. 7, 2026. (AP Photo/Ty ONeil)

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FILE - Usually submerged areas of the Danube River are exposed amid a drought in Rasova, Romania, Monday, Aug. 3 2026. (AP Photo/ Vadim Ghirda, File)

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A man splashes water on a horse to cool it off next to a bank of sand on the Danube River, as usually submerged areas are exposed due to extreme low levels of the water following an extended period of drought in Roseti, Romania, Wednesday, July 29, 2026. (AP Photo/Andreea Alexandru)

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The Romanian Navy detonates underwater explosives during a controlled demolition of submerged rocks to improve water flow to the Cernavoda Nuclear Power Plant amid exceptionally low water levels on the Danube River, in Izvoarele, Romania, Monday, Aug. 3, 2026. (AP Photo/Andreea Alexandru)