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Is rubber considered a microplastic?

edit: oh no, tyres use 24% synthetic rubber (which is a plastic polymer) :(

Yes, vehicle tires are a big source of microplastics.

Is there any research how to make tires shed less plastic and carbon black?

So because roads already involve microplastics, we don't have to care about there being even more?

We have an easy and better alternative to plastics road but we dont fore tire, so there's that.