The alarming rate of population growth followed by the need for acquisition of quality life has put excessive pressure on all of the natural resources. In order to meet the basic needs of mandkind, there is rapid deforestation, industrialization. All these human activities along with some natural occurrences have modified and even transformed the basic components of the environment.
Some of these components have changed to such an extent that they cannot be set right by the self regulatory mechanism of the environment. Consequently, the changed environmental conditions adversely affect the living organisms of the biophere.
The overall lowering of environmental qualities due to the damages caused by both natural events and human activities in the basic structure of the environment at local, regional and global levels adversely affecting all living organisms, including man.
