They do that in Belgium as well. At the Dranouter festival (one of the biggest in Europe), there are different bins for glass, paper, cans and other waste. There are gangs of children (Belgian boy scouts) who scour the site for bottles, cans and paper, because they get a bonus for each bagful they bring in. Consequently, the whole site is much cleaner, less wasp infested and safer for everyone, and takes less clearing up than some other festivals I've attended.

LTS