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It's less about recycling and the environment and more about the health effects of silica exposure, which is why they have banned it in Australia:
https://www.theguardian.com/australia-news/2023/dec/14/australia-will-become-the-first-county-to-ban-engineered-stone-bench-tops-will-others-followIgnore me Corian's ok, just don't get fake stone made with silica.
Fox
Madhias
I guess that's mainly from a recycling perspective? I've read a little bit about it but didn't find much things about it being environmentally (very) bad.