pollution
Pollution is everything that makes the Earth unhealthy and dirty.
There are three main types of pollution: water pollution, air pollution and soil pollution.
Air pollution is caused by the things that people do such as driving cars or making things in factories.
People burn fuels. It makes carbon dioxide emissions.
Forest fires and volcanic eruption can cause air pollution.
Wars can cause pollution.
People throw plastic and chemicals in water. This causes water pollution.
This is bad for all living things.
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