We live on earth in different types of surroundings. This surrounding is our environment. We eat, breathe, clothe ourselves, reproduce and then die. The next generation comes and the cycle goes on; and the human race flourishes on earth.
The physical environment on the earth provides favorable conditions for the existence and growth of different life forms, including man. These living beings constitute the biological environment. Bothe the physical and biological environments are in a close interaction with each other and form a stable self perpetuating system.
In prehistoric days man lived in harmony with nature but in the course of his evolution man has developed a new type of environment, the man-made environment. Man is a social animal; the socio-cultural environment also plays an important role in his life.There are three types of environments i.e. natural, man-made and social environment.
The environment is constantly changing and this affects life on earth; some these effects can be lasting and irreversible. So we must realize that we should be concerned about environment.