Several animal rights groups, including People for the Ethical Treatment of Animals (Peta), plan to hold signs during a Denver talk next month by former Vice President Al Gore that say, "Too chicken to go vegetarian? Meat is the No 1 cause of global warming." The UK's Telegraph newspaper reported that "According to recent UN Food and Agriculture Organisation research, animal agriculture generates 18 per cent of the world's greenhouse gas emissions - more than the 13.5 per cent produced by all forms of transport combined."