Ian is sceptical about the prospects that people might choose to have a vegetarian meal once a week for the sake of fighting global warming. I am not so sure. I first heard this idea a few months ago from the former Dutch liberal party leader Lousewies van der Laan, who is now a UN consultant on environmental issues. Then last weekend in Bled I was slightly stunned to hear it recommended emphatically by Wolfgang Schüssel, the former Chancellor of Austria. I basically agree with Ian that few people will change their lifestyles on the say-so of a UN official. But when political leaders (especially senior conservative politicians in countries famous for their meat dishes) start saying so too, then I reckon it may catch on.