Green not as in colour but eco-friendliness. One of the biggest environmental headaches is vinyl chloride. Chemical firms around the world are under pressure to tackle aquifer pollution from this highly useful but dangerous main ingredient in PVC products.Now, say a group of scientists, there's an answer. It is a disc-shaped bacterium that gobbles up vinyl chloride and anotehr toxic derivative, dichloroethene. It dies when its source of food runs out. The bacterium is quite harmless to humans and the environment.The remarkable bug has been dubbed BAV1 by its discoverers, a team led by German microbiologist Frank Loeffler in Atlanta.