When you throw stuff away, you might be very glad to get rid of it: into the trash it goes, never to be seen again! Unfortunately, that's not the end of the story. The things we throw away have to go somewhere—usually they go off to be bulldozed underground in a landfill or burnt in an incinerator. Landfills can be horribly polluting. They look awful, they stink, they take up space that could be used for better things, and they sometimes create toxic soil and water pollution that can kill fish in our rivers and seas.