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Pollution
Any dirty or harmful substance in the environment.
Pesticides
Products used on crops to control insects and other pests.
Acid Rain
Rain that is far more acidic than normal.
Smog
A yellow-brown haze that forms when sunlight reacts with air pollution.
Ozone Layer
A shield that protects living things from ultraviolet (UV) radiation.
Greenhouse Effect
The trapping of heat by carbon dioxide and other gases in the air.
Global Warming
A rise in the earth’s temperatures.
Landfills
Huge pits where wastes are dumped and buried.
Hazardous Wastes
Human-made liquid or solid wastes that may endanger human health or the environment.
Environmental Protection Agency (EPA)
The governmental agency that is committed to protecting the environment.
Biodegradable
Broken down easily in the environment.
Nonrenewable Resources
Substances that cannot be replaced once they are used.
Conservation
The saving of resources.
Precycling
Reducing waste before it occurs.