Climate News Network: The news is enough to make climate campaigners choke on their high-fibre breakfast cereal: If Americans adopted the dietary guidelines suggested by their own Department of Agriculture, greenhouse gas emissions (GHGs) would actually go up by 12 percent. And even if Americans did what dietary campaigners urge and restricted themselves to a healthier 2000 calories a day, GHGs would not fall significantly. Martin Heller and Gregory Keoleian, scientists at the University of Michigans Centre for Sustainable...