There’s an extreme idea to get people to stop littering the streets with trash: Swab the trash for the DNA of the litterer, run it through a citizen database, then name-and-shame the culprits with a poster campaign. Simple results, no more littering.
That’s basically what an environmental cleanup-group did in Hong Kong recently as part of a campaign to draw attention to the city’s litter problem. It wasn’t real in the sense that the images of litterers were composites of people’s faces, not actual people. But it certainly had the desired effect: The campaign generated lots of publicity for the groups involved.