Activist Heather Mills is campaigning to rid the world of meat-eaters - in a bid to end global warming. The estranged wife of Beatle star Sir Paul MCCartney will appear at Speaker's Corner in London's Hyde Park - a specially designated space where public speaking is allowed - to voice her views promoting vegetarianism. The one-legged former model is convinced that plant-rich diets reduces environmental harm. Mills has also been lined up to appear in two 'green' advertisements for the Vegetarians International Voice for Animals (Viva) organisation, blaming carnivores for rising earth temperatures. One advert will see Mills poke fun at her disability - she lost her right leg in a 1993 accident - telling meat-eating environmentalists, "You haven't got a leg to stand on." Mills says, "End your involvement in this vandalism overnight. Change your diet, change the world!"