An unusual natural phenomenon appeared on Lake Lipno in South Bohemia, the Czech Republic, at the end of 2025. Large amounts of accumulated cyanobacteria in the water caused the ice to turn green. The phenomenon was thoroughly documented by hydrobiologists from the Biology Center of the Czech Academy of Sciences, who also collected and analyzed water samples.
Surprising green ice on Lake Lipno: Cyanobacteria bloom in mid-winter
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