Vast and Pristine, Russia’s Lake Baikal Is Invaded by Toxic Algae

LAKE BAIKAL, Russia — Yury Azhichakov set out early by bike for Senogda Bay, his favorite beach, on the northwestern shore of Lake Baikal in Siberia. The world’s oldest, deepest and most voluminous lake, Baikal holds 20 percent of the planet’s unfrozen freshwater. It is often described as the world’s cleanest lake.
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