Where do pizza boxes go? What exactly is rigid plastic? How clean do empty jars need to be? Relax, experts say.

60. If you only have one shelf if your freezer, consider using an expandable self or under-shelf basket. Place either of ...

Sorting out answers at Staten Island’s giant paper pulp vat and the massive sifter in Brooklyn — including why seeing metal thrown in the trash makes one waste expert “weak in the knees.” ...