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Stefan Uhlenbrook, director of Hydrology, Water and Cryosphere at the World Meteorological Organization (WMO), presents the WMO's State of Global Water Resources report during a press conference at the European headquarters of the United Nations in Geneva, Switzerland, Monday, Oct. 7, 2024. (Salvatore Di Nolfi/Keystone via AP)

Stefan Uhlenbrook, director of Hydrology, Water and Cryosphere at the World Meteorological Organization (WMO), presents the WMO's State of Global Water Resources report during a press conference at the European headquarters of the United Nations in Geneva, Switzerland, Monday, Oct. 7, 2024. (Salvatore Di Nolfi/Keystone via AP)

A part of the Negro River is dry at the port in Manaus, Amazonas state, Brazil, Friday, Oct. 4, 2024, amid severe drought. (AP Photo/Edmar Barros)

A part of the Negro River is dry at the port in Manaus, Amazonas state, Brazil, Friday, Oct. 4, 2024, amid severe drought. (AP Photo/Edmar Barros)

Celeste Saulo, secretary-general of World Meteorological Organization (WMO), presents the WMO's State of Global Water Resources report during a press conference at the European headquarters of the United Nations in Geneva, Switzerland, Monday, Oct. 7, 2024. (Salvatore Di Nolfi/Keystone via AP)

Celeste Saulo, secretary-general of World Meteorological Organization (WMO), presents the WMO's State of Global Water Resources report during a press conference at the European headquarters of the United Nations in Geneva, Switzerland, Monday, Oct. 7, 2024. (Salvatore Di Nolfi/Keystone via AP)

Stefan Uhlenbrook, left, director of Hydrology, Water and Cryosphere at the World Meteorological Organization (WMO), sits next to WMO Secretary-General Celeste Saulo as he presents the WMO's State of Global Water Resources report during a press conference at the European headquarters of the United Nations in Geneva, Switzerland, Monday, Oct. 7, 2024. (Salvatore Di Nolfi/Keystone via AP)

Stefan Uhlenbrook, left, director of Hydrology, Water and Cryosphere at the World Meteorological Organization (WMO), sits next to WMO Secretary-General Celeste Saulo as he presents the WMO's State of Global Water Resources report during a press conference at the European headquarters of the United Nations in Geneva, Switzerland, Monday, Oct. 7, 2024. (Salvatore Di Nolfi/Keystone via AP)

FILE - Barges float in the Mississippi River as a portion of the riverbed is exposed, on Sept. 15, 2023, in St. Louis. The U.N. weather agency is reporting that 2023 was the driest year in more than three decades for the world's rivers, as the record-hot year underpinned a drying up of water flows and contributed to prolonged droughts in some places. (AP Photo/Jeff Roberson, File)

FILE - Barges float in the Mississippi River as a portion of the riverbed is exposed, on Sept. 15, 2023, in St. Louis. The U.N. weather agency is reporting that 2023 was the driest year in more than three decades for the world's rivers, as the record-hot year underpinned a drying up of water flows and contributed to prolonged droughts in some places. (AP Photo/Jeff Roberson, File)

Celeste Saulo, secretary-general of World Meteorological Organization (WMO), presents the WMO's State of Global Water Resources report during a press conference at the European headquarters of the United Nations in Geneva, Switzerland, Monday, Oct. 7, 2024. (Salvatore Di Nolfi/Keystone via AP)

Celeste Saulo, secretary-general of World Meteorological Organization (WMO), presents the WMO's State of Global Water Resources report during a press conference at the European headquarters of the United Nations in Geneva, Switzerland, Monday, Oct. 7, 2024. (Salvatore Di Nolfi/Keystone via AP)