Cardboard, in and of itself, does not pollute the environment, although great heaps of it lying around are pollution of a sort. All cardboard is recyclable, however the great polluting danger here is the ink that is used to print on cardboard. With the exception of most black ink, all other ink is highly polluting and dangerous to the enviroment. To a lesser degree, some cardboard is coated with wax or plastic. These coatings are also polluting. Most responsible corporations and individuals separate cardboard from other trash for the specific purpose of recycling.