Guardian: In just three short years, the environment has returned to the front pages with a vengeance, even if the G20 managed to relegate it to the end of their communique. Near the top of the environmental agenda is food and its production. Whether it be at the macro level of food security or the micro, or the way in which we grow it or the health benefits of growing your own, today’s focus on food is, for me, qualitatively different to previous lifestyle magazine exhortations to “grow our …