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Lauren Singer is a zero-waste blogger based in New York City. She has produced so little landfill rubbish in four years that it isn’t even worth throwing away. Instead, she proudly displays it in a glass jar. She says one of the most common questions that people ask her is: “How do you have sex?” Are there condoms in the jar, they wonder. Or are zero-wasters too busy for sex, what with all that recycling and making their own toothpaste? On the contrary, Singer tells me. “Environmentalists are horny right now.”

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