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| '''Pollution''' is the introduction of contaminants into an environment that causes adverse effects on either the environment or humans. In 2015, pollution killed 9 million people worldwide.<ref>{{News citation|journalist=Deutsche Welle|date=2020-01-25|title=The world’s most polluted river {{!}} DW Documentary|url=https://youtu.be/GEHOlmcJAEk|newspaper=[[Deutsche Welle]]|archive-url=|archive-date=|retrieved=}}</ref> | | '''Pollution''' is the introduction of [[Contaminant|contaminants]] into the natural environment that cause adverse change. Pollution can take the form of [[Chemical substance|chemical substances]] or [[energy]], such as noise, heat, or light. [[Pollutant|Pollutants]], the components of pollution, can be either foreign substances/energies or naturally occurring contaminants. Pollution is often classed as [[Point source pollution|point source]] or [[nonpoint source pollution]]. In 2015, pollution killed 9 million people worldwide.<ref>https://youtu.be/GEHOlmcJAEk</ref> |
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| As with many other [[:Category:Social issues|social issues]], pollution arises out of a specific [[mode of production]]. For example, air pollution increases if a society chooses to orient itself towards personal internal combustion vehicles rather than high speed rail, which emits significantly less pollution on a per-passenger-mile basis.<ref>{{News citation|journalist=Hannah Ritchie|date=2020-10-13|title=Which form of transport has the smallest carbon footprint?|url=https://ourworldindata.org/travel-carbon-footprint|newspaper=Our World in Data|archive-url=|archive-date=|retrieved=}}</ref>
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| == References ==
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| <references />
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| [[Category:Social issues]]
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