[cogman10]

I'd expect almost the opposite. Plastics left in the sun tend to turn brittle, I'd expect that to be a big contributor to microplastics generally in the environment as those plastics break down.

But I agree, would be interesting to know.

I've been switching my stuff over to glass when possible. But, unfortunately unless I become a full-time farmer there's no escaping the fact that my food comes wrapped in plastic that's wrapped in plastic and further wrapped in more plastic. Single use plastics for food should be heavily restricted.