Paper and paper goods, that is to say, trees.
Oil and petroleum products, that is to say, plastic of all sorts -- toys, disposable pens, food packaging, plastic bags, containers of all kinds.
Metals of all types.
Food of many different types and kinds -- any dumpster diver can tell you that he or she can eat well based on just what people throw away uneaten.
Landfill -- how many acres of perfectly good land are taken up with the offal that people dispose of?
That's just a short list. There's a good book called "Garbage" by the editor of the "Atlantic Monthly," a guy named Cullen Murphy, that could tell you lots more about it.
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