I got back from a couple of workshops in Princeton in America yesterday. They included a talk by an author of this paper on how we appear to be changing the summer rainfall that India relies on to grow the crops to feed its billion people. On my doormat I found an election flyer by the Guildford’s save the greenbelt party. There is an election in the UK the week after next. They want to stop house building on green fields in the Guildford area. I don’t doubt their sincerity, and green fields are something we all enjoy. But when you read about the changes in rainfall that crops required by a billion people, this does look a bit parochial.