Look over there, there's a group of Tree Huggers coming over!!! Quick Ermintrude, copy me, pretend you're a car. Buurrrrrrruuummmmm Buurrrrruuummmm...A United Nations report has identified the world's rapidly growing herds of cattle as the greatest threat to the climate, forests and wildlife. And they are blamed for a host of other environmental crimes, from acid rain to the introduction of alien species, from producing deserts to creating dead zones in the oceans, from poisoning rivers and drinking water to destroying coral reefs. Livestock are responsible for 18 per cent of the greenhouse gases that cause global warming, more than cars, planes and all other forms of transport put together.