I just followed links in this article. https://tireindustryproject.org/faq/are-tires-the-main-sourc... is the link in the article, which relies on https://www.e-a.earth/plastic-paints-the-environment/.

I confess confusion, here, as the article links in this as support of the tire claim. Which is in contradiction to what it says. Specifically, the article links it as support of a 28% claim, when the link is challenging that number.