But the impact of manufacturing a stainless steel cup is significant, so you really need to use that cup a lot to make it worthwhile. And you're replacing dozens or even hundreds of single-use cups with that one reusable mug," said Sandra Goldmark of Columbia University's Climate School. Of course, this gets even hairier when you consider that Stanley cups have peaked in trendiness, and are now the domain of middle schoolers. The takeaway — at least environmentally: one Stanley cup is good. Many Stanley cups … not so good.

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Persons: Stanley Quencher, Stanley, Sandra Goldmark, you've, —, … Organizations: Service, Business, The New York Times, Columbia, Climate Locations: California, trendiness