The ecology studies the relationships between the living organism and theenvironment where they live. It also requires thinking and discussing about the livingconditions and survival of a society. When talking about << environment >>, indicates particularly a relationshipwhich exists between the nature and the society they inhabit. This prevents us fromunderstanding the nature as something separate from us or as a mere framework of ourlives. We are included in it, we are parts of it and we are correlated. The reasons why aplace is contaminated requires an analysis of the functioning of society, economy,behavior, their ways of understanding reality.