Possibly a dumb question, but how much plastic exists in tires? I figured they were mostly natural rubber. Naturally, that must be outdated. From my own naive

Possibly a dumb question, but how much plastic exists in tires? I figured they were mostly natural rubber. Naturally, that must be outdated. From my own naive Google search on "how much plastic in the average tire", I see https://www.nationalgeographic.com/environment/article/tires-unseen-plastic-polluter https://www.nationalgeographic.com/environment/article/tires... says, highlighted by goog: > By 1931 the U.S. chemical company DuPont had industrialized the manufacturing of synthetic rubber. Today tires consist of about 19 percent natural rubber and 24 percent synthetic rubber, which is a plastic polymer.