Discussion of where our waste comes from, and where it goes, and why we should recycle.
Gather everyone round in a circle and discuss the issue. Point out that plastic based waste comes originally from oil- which we have a limited amount of- and when we bury waste in landfill sites we're losing the resources used to make it in the first place. That as well as material resources, more energy is needed to make new packaging than recycle old- glass for instance. That landfill sites are filling up, and nobody wants a new landfill site near them because they're dirty and smelly- because they're big piles of rotting rubbish.