Eventually, though, like Franklin-Wallis, Schaub comes to see that she’s been living a lie. Midway through her experiment, she signs up for an online course called Beyond Plastic Pollution, offered by Judith Enck, a former regional administrator for the E.P.A. Only containers labelled No. 1 (pet) and No. 2 (high-density polyethylene) get melted down with any regularity, Schaub learns, and to refashion the resulting nurdles into anything useful usually requires the addition of lots of new material. “No matter what your garbage service provider is telling you, numbers 3, 4, 6 and 7 are not getting recycled,” Schaub writes. (The italics are hers.) “Number 5 is a veeeery dubious maybe.”