From Eric Kvaalen, Les Essarts-le-roi, France
“All of the food you've ever eaten originated with sunlight captured by plants just a few months or years before you ate it,” you say in reporting animal feed grown on methane (19 November, p 10). I often buy coleslaw that contains “vinaigre d'alcool” – which is made from alcohol synthesised from ethylene, derived from petroleum. I am partly fuelled by fossil fuel.
