Global river deoxygenation threatens freshwater ecosystems, tropical rivers at risk

Scientific experts report that rivers worldwide are experiencing declining dissolved oxygen levels, creating 'dead zones' that endanger fish and aquatic life, with tropical rivers particularly vulnerable. The claim is based on expert commentary rather than a specific new study, and the extent and pace of deoxygenation remain uncertain. This matters because freshwater ecosystem degradation could disrupt biodiversity, water quality, and dependent human communities.