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Pollution is the introduction of contaminants into the natural environment that cause adverse change.

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Pollution is often classed as point source or nonpoint source pollution.

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In 2015, pollution killed 9 million people in the world.

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It may cause diseases, allergies and even death to humans; it may also cause harm to other living organisms such as animals and food crops, and may damage the natural or built environment.

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Air pollution has always accompanied civilizations. Pollution started from prehistoric times, when man created the first fires.

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Major forms of pollution include: Air pollution, light pollution, littering, noise pollution, plastic pollution, soil contamination, radioactive contamination, thermal pollution, visual pollution, water pollution.

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Learn about Pollution | Environment Defilement | Cartoon

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Air pollution occurs when harmful or excessive quantities of substances including gases, particulates, and biological molecules are introduced into Earth's atmosphere.

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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/energies or naturally occurring contaminants.