The world appears to have gone plastic bottle crazy, largely driven by a bottled water obsession (https://www.theguardian.com/environment/2017/jun/28/a-million-a minute-worlds-plastic-bottle-binge-as-dangerous-as-climate-change). So many, non-returnable plastic bottles (estimated as a million per minute on a world-wide basis), utilise lots of the oil reserves, are generally difficult to biodegrade and are now filling environments (from the highest mountains to the deepest seas) with rubbish. I am a strong supporter of effective hydration (as high-speed shuffler, I would be) but I cannot believe (as apparently some of my students do) that they are endangering their health in a 45 minute lecture, if they lack a water bottle. Mostly people buy vastly over-priced water when the mains stuff is perfectly good enough. Perhaps a deposit-return system would be helpful?
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