Reduce! Reuse! Recycle! All right? Maybe — maybe not, says scholar Daniel K. Benjamin. Making an unused tissue out of a used one wastes resources and hardly benefits the environment. Melting and casting aluminum cans, though, both saves resources and benefits the environment. But you donﾒt need to exhort the aluminum company to save those resources: saving scraps is in its own interest. So why does it take a lesson from your third-grade teacher to get you to recycle household waste?