The answer is pollution. It is the introduction of noxious waste into the natural environment that cause adversative transformation. Pollution can take the form of chemical substances or energy, such as noise, heat or light. Pollutants, the components of pollution, can be either foreign substances or energies or naturally occurring contaminants but the majority of human activities causes the different kinds of pollution especially air pollutions. For instance, increased fossil fuel incineration from motor automobiles, industrial factories and power plants all propel large quantities of air pollutants, such as carbon monoxide, ozone and nitrous oxides, into the atmosphere.
