Climate Change Is Quietly Choking Rivers Across the Planet

A global study found river oxygen levels have fallen across most of more than 21,000 monitored river reaches since 1985.

Tropical rivers showed the sharpest declines, and heatwaves made deoxygenation worse.

Researchers warn that lower dissolved oxygen could destabilize freshwater ecosystems and threaten fish and other aquatic life.

The findings, published in Science Advances, highlight a growing climate-driven risk to freshwater biodiversity, especially in warm regions like India.