Sea glass isn't everywhere; you have to have a beach that is near where there has been a population for some decades, so glass garbage was created 50-100+ years ago.
Often, we don't look down on the beach unless we are looking for something specific, so it is entirely possible you have seen it, and not known.
So there are some conditions in order to find sea glass not just a random place at the beach.
It means you just visit a specific beach to looking sea glass. Very interesting
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