Define pollution. How is it caused?
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Answer:
Pollution
For other uses, see Pollution (disambiguation).
For the academic journal, see Environmental Pollution (journal).
Pollution is the introduction of contaminants into the natural environment that cause adverse change.[1] 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. Pollution is often classed as point source or nonpoint source pollution. In 2015, pollution killed 9 million people worldwide.
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