![]() ![]() The usefulness of the natural resource is usually impaired by the presence of pollutants and contaminants." In contrast, the United Nations considers pollution to be the "presence of substances and heat in environmental media (air, water, land) whose nature, location, or quantity produces undesirable environmental effects." The United States Environmental Protection Administration defines pollution as "Any substances in water, soil, or air that degrade the natural quality of the environment, offend the senses of sight, taste, or smell, or cause a health hazard. Various definitions of pollution exist, which may or may not recognize certain types, such as noise pollution or greenhouse gases. ![]() Major forms of pollution include air pollution, light pollution, litter, noise pollution, plastic pollution, soil contamination, radioactive contamination, thermal pollution, visual pollution, and water pollution. Air pollution accounted for ¾ of these earlier deaths. This remained unchanged in 2019, with little real progress against pollution being identifiable. In 2015, pollution killed nine million people worldwide (one in six deaths). Pollution is often classed as point source or nonpoint source pollution. ![]() 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. Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants. Pollution can take the form of any substance (solid, liquid, or gas) or energy (such as radioactivity, heat, sound, or light). Pollution is the introduction of contaminants into the natural environment that cause adverse change. ![]()
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