2. Why is it Dangerous?

Not all blue-green algae are dangerous to humans and domestic animals, although any major algae bloom can cause problems for the ecosystem as a whole. However, some types of blue-green algae produce toxins when the cells break down during their natural lifecycle. These cyanotoxins can cause everything from minor skin irritation to serious nervous system impairment.

dangerous blue-green algae NNehring / Getty Images

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