Our kindergarten participates in the 'Těžíme hliník' (Mining aluminium) competition. This year we're the best in the town.
The goal is to put aside any aluminium waste and deliver it separately. It's organized entirely by volunteers and any money made come directly to the participating organizations. Which is around 5000 Kč (200 €) this year.
Last year our family had some leftovers from the cellar, but this year we were completely dependant on yoghurt lids and a couple of beer cans donated by friends, so I doubt we made more than ~1 kg. Apparently the other kids more than compendsated for it and the average was 2.4 kg per kid.