The careful use of resources is called

Greenhouse gases include carbon dioxide, methane, and oxygen.

Before its used oil must be sent to a refinery.

When ALL the trees in an area are cut down.

Partially decayed plant material that is created in the formation of coal.

Set maximum contaminant levels for a number of pollutants in drinking water that could be harmful to human health.

Energy that comes from the heat of the Earth's interior.

Decade when the most environmental laws were passed.

Type of environment where oil and natural gas formed millions of years ago.

Blocks UV radiation from the sun.

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