Reduce! Reuse! Recycle! All right? Maybe — maybe not, says scholar Daniel K. Benjamin. Making a new tissue out of a used one wastes resources - hardly a benefit the environment. Melting and casting aluminum cans, though, both saves resources and benefits the environment. Just ask the aluminum company: they know that saving scraps pays for itself. So why does it take a lesson from your third-grade teacher to get you to recycle household waste?