This provides fodder for fun jabs and inside jokes, but it did get me wondering: Why do coffee and tea stain all my mugs, and why are the stains so hard to get rid of? With these questions in mind ...
Just think of 10,000 coffee cups every day ending up “on that big mountain of rubbish, for no reason at all,” says Korae grimly. It’d be a shame even if the waste were recyclable – but of ...