Lichen is a pioneer organism that thrives where nothing else can—arctic tundra, hot deserts, rocky coasts and toxic slag heaps, for example. Lichen is intolerant of pollutants; in some European cities, they put lichen stones on rooftops and monitor its health to gauge air quality, mapping what they call "lichen islands."  World's First Lichen Garden? by Jaime Gillin

World's First Lichen Garden?

Lichen is a pioneer organism that thrives where nothing else can—arctic tundra, hot deserts, rocky coasts and toxic slag heaps, for example. Lichen is intolerant of pollutants; in some European cities, they put lichen stones on rooftops and monitor its health to gauge air quality, mapping what they call "lichen islands."

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