Such nonsense that green ponds only appear in America. Various kinds of duckweed appear all over the world, including Europe. I am well accustomed to the sight of green vegetation on a pond's surface.
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Apart from that, this is a moot point anyway because regular water was often painted green. This has nothing to do with vegetation, but rather with artistic convention an cultural perception.
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Apart from that, this is a moot point anyway because regular water was often painted green. This has nothing to do with vegetation, but rather with artistic convention an cultural perception.