Click on the images below to learn more about why this is a harm

* NRDC's "Air Pollution: Everything You Need to Know"

* Explains the causes of air pollution and how it affects earth's climate and our health as well as how these effects can be mitigated

* NRDC's "Water Pollution: Everything You Need to Know"

The causes, effects, and ways to prevent water pollution

National Geographic's "Pollution"

Defines the types of pollutants and their sources

* EEA's "Land & Soil Pollution -- Widespread, Harmful, & Growing"

Describes the danger of chemicals and how they get into our landscapes

Environmental Pollution Center's "Noise Pollution"

Gives the definition of noise pollution as well as its effects on human health and wildlife health

International Dark-Sky Association's "Light Pollution"

Depicts the physical effects of light pollution and provides helpful maps and images

Dark Site Finder's Map of Light Pollution

An interactive map of light pollution around the globe

Exposure to Environmental Pollutants

This includes air pollution, water pollution, noise pollution, and light pollution.