Police have warned of the growing threat of eco-terrorism after revealing they are investigating a group which has supporters who believe that reducing the Earth’s population by four-fifths will help to protect the planet. Officers from a specialist unit dedicated to tackling domestic terrorism are monitoring an eco-movement called Earth First! which has advocates who state that cutting the Earth’s population by 80 per cent will ease pressure on other species. The unit is currently monitoring blogs and internet traffic connected to a network of UK climate camps and radical environmental movements under the umbrella of Earth First!, which has claimed responsibility for a series of criminal acts in recent months. ‘We have found statements that four-fifths of the human population has to die for other species in the world to survive.