Pollution is a major problem of our times.Air, water and land are all polluted.Poor waster disposal is to blame for many of the problems and the situation is particulary acute in heavily Industrialised and over-populated regions.Pollution of the atmosphere has led to the destruction of the ozone layer and to the greenhouse effect.Other environmental problems have been caused by too rapid a used of resources.There are far fewer fish in the sea because of over-fishing and the destruction of the rainforests is having unforeseen ecological consequences.Battery farming Provides a lot of food but involves keeping animals in unnatural and unhealthy conditions.