In mid June 2009 I went to the launch of Meat Free Mondays. Frontman Paul McCartney gave a straightforward and inspiring speech stating the obvious – meat eating is responsible for about one quarter of the world’s increase in greenhouse gas levels each year. If we all gave up meat just one day a week, this could make a significant difference to our headlong rush towards extinction on an overheated planet. Not particularly challenging you might think – one day a week without meat isn’t going to have anyone in the developed world turning up at the doctor’s with kwashiorkor or some other protein deficiency disease, is it? In fact, a little less protein might help with the obesity boom – could be win – win: we end up healthier and our grandchildren inherit a planet that is still habitable.