Honk + Thumbs Down at any driver you see tossing one out the window. Public shaming (not anger like a middle finger) can be very effective. That said, this is

Honk + Thumbs Down at any driver you see tossing one out the window. Public shaming (not anger like a middle finger) can be very effective. That said, this is probably 90% China as we saw with the ocean plastics source data. Not sure if this approach would work there.