Overview

• Researchers have documented at least 75 rivers and streams in Alaska turning orange due to thawing permafrost.
• The discoloration is caused by the release of metals like iron, zinc, and copper, making the water highly acidic.
• Affected waterways have pH levels as low as 2.3, comparable to vinegar, posing a threat to aquatic life and fisheries.
• The phenomenon, first observed in 2018, is visible from space and has led to the decline of fish species in some areas.
• Scientists warn that the situation could worsen as climate change accelerates permafrost thawing.