Alaskan rivers turn orange as permafrost thaws, threatening fish and communities

Mongabay
Sep 25, 2025, 9:09 am130 pts
The writer John McPhee once described Alaska’s Salmon River as having “the clearest, purest water” he’d ever seen. Today, that same river runs orange with toxic metals unleashed by thawing permafrost. “During the summer of 2019, the clear waters of the Salmon turned distinctly orange and have remained…

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