We don't know perfectly for everywhere, but I can talk to you about some of the different pathways.
One, when we do cleanups or we have Seabins, for example, on our waterfronts, we know that for large plastics, some of these single-use plastic items are what we commonly find. In the case of microplastics, broken-down bits of things we can't recognize might be from there.
I'll be honest and say that a lot of what we find are microfibres from textiles and bits of tire rubber from cars. There certainly are different sources. Single-use plastics are one pathway. There are a lot of pathways when it comes to microplastics.