Pollution and air pollution
Pollution is the introduction of contaminants into the natural environment that cause adverse change. Pollution can take the form of any substance or energy. Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants. Although environmental pollution can be caused by natural events, the word pollution generally implies that the contaminants have an anthropogenic source—that is, a source created by human activities. Pollution is often classed as point source or no point source pollution . In 2015, pollution killed 9 million people worldwide. The major kinds of pollution, usually classified by environment, are air pollution, water pollution, and land pollution . Modern society is also concerned about specific types of pollutants, such as noise pollution, light pollution, and plastic pollution. Major forms of pollution include air pollution , light pollution , litter , noise polluti...