Scientists have warned that climate change and pollution are causing a dangerous decline in oxygen levels in rivers across the world, threatening freshwater ecosystems and aquatic life. A major international study found that rising global temperatures, agricultural runoff, sewage discharge, and industrial pollution are reducing dissolved oxygen in rivers at an alarming rate.
Oxygen is essential for fish, insects, plants, and microorganisms living in freshwater habitats. When oxygen levels fall too low, rivers can experience “dead zones” where aquatic organisms struggle to survive. Researchers say warmer water caused by climate change holds less oxygen naturally, while nutrient pollution from fertilizers and waste fuels excessive algal growth. As algae die and decompose, they consume even more oxygen, worsening the crisis.
The study warns that oxygen depletion could severely impact fish populations, freshwater biodiversity, and food security for communities dependent on rivers. Sensitive species may disappear entirely from affected regions, while harmful bacteria and invasive organisms could spread more easily in degraded waterways.
Experts are calling for urgent action to reduce greenhouse gas emissions, improve wastewater treatment, restore wetlands, and control agricultural pollution. Scientists stress that protecting river ecosystems is essential not only for biodiversity, but also for drinking water supplies, fisheries, agriculture, and climate resilience worldwide.
News as reported
