As dawn breaks, there is a steady stream of customers at Muhammed's tea shop in Chennai. As they arrive, he serves them tea in glass tumblers. However, one customer insists on a paper cup for hygiene reasons, despite Muhammed explaining that the glass tumblers are washed and sterilised with hot water. Glass tumblers cost around Rs 20 each and can be reused hundreds of times until they break. In contrast, paper cups cost Rs 100 for 50 cups (Rs 2 per cup) and are neither reusable nor environment-friendly. “Though plastic-coated paper cups are banned, we can’t avoid using them when…
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