Scientists find climate change is reducing oxygen in rivers worldwide

A fisherman walks to his boat in Santa Rosa, Peru, an island on the Amazon River, on Aug. 17, 2025. (AP Photo/Ivan Valencia, File)

Ships are anchored near the Chesapeake Bay Bridge, March 18, 2026, in Maryland. (AP Photo/Julia Demaree Nikhinson, File)

A man unloads fresh fish from a boat in Puerto Narino, Colombia, along the Amazon River, Sept. 7, 2025. (AP Photo/Fernando Vergara, File)

Tourists take a boat ride early morning in the Ganges river in Varanasi, India, March.16, 2026. (AP Photo/Channi Anand, File)

WASHINGTON (AP) — Global warming is causing rivers to slowly lose oxygen, threatening fish and other lives in the waterways, a new study shows.