Pollution is the degradation of habitat through the introduction, usually human, substances or radiation, causing a disturbance more or less important to the ecosystem. It can also be caused by a geological phenomenon as a volcanic eruption.
The pollution of human origin can have a major impact on the ecosystem as evidenced by the warming climate that transforms the atmosphere of the Earth and its ecosystem, resulting in the emergence of diseases previously unknown in certain geographical areas, migration of certain species or their extinction if they can s’ to adapt to their new biophysical environment.
It was after the Second World War that awareness of human impact on the environment is created through the birth of environmentalism. Environmental concerns led governments to take measures to reduce the ecological footprint of human populations, pollution and to counter human contamination.
