A few weeks ago, I asked my teenage daughters where they would like to have dinner. "Anywhere that doesn't use plastic straws!" they declared.

It was a telling moment. Until recently, the main warriors against plastic straws were committed environmentalists - green campaigners have warned for years that single-use plastics cause alarming pollution, since they are ubiquitous and not biodegradable. (It's estimated that between 200-million and 500-million plastic straws were used in the US each day in 2017.)

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