Global Warming and Climate Change have become, literally, the hot topics of the 21st Century. New Zealand sells itself with its "100% Pure" image: we are supposedly clean and green. However, one of the most significant contributors to global warming is methane gas - and with millions of sheep and cows, New Zealand is a veritable methane gas factory. As this film shows in its Monty Pythonesque way: we may not have obvious great smoke stacks spewing out pollutants, but we have bovine digestive tracts that are equally insidious. "Silent but violent" takes on a whole new meaning in this film that is as much fun as it is serious.