What is Pollution?
Pollution is anything that people do those damages the natural environment. For example, if poisonous chemicals are not properly thrown away, they can get into the ground, water, or air.
There are many ways that people pollute the earth. When poisonous chemicals, such as paints and fertilizers, are dumped into rivers and lakes, the plants and animals that use that water may become sick or die.
When waste from people and animals gets into the soil and water, the plants and animals that use that soil and water may become sick.
Some pollution damages the air. Smog is one kind of air pollution. It is created by the action of sunlight on exhaust from cars and factories. Very heavy smog can hurt people. Even countries that work to improve their own air can be polluted by air from a neighboring country.
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