this post was submitted on 20 Aug 2024
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For anyone else who was curious about lichens covering "a not insignificant amount" of the earth's surface, a quick google tells me it's about 7% (according to e.g. new york times, scientific american, etc)
Edit: oh and estimating the age of an exposed surface by lichen diameter is called lichenometry. I'm seeing stuff about it being used in geological contexts but it makes sense that it could work for old buildings too