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| an increase in the average temperature of the Earth's atmosphere. |
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| the trapping of the Sun's heat by gases in the Earth's atmosphere. |
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| a gas composed of carbon and oxygen. |
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| any gas in the atmosphere that contributes to the greenhouse effect. |
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| fuels such as coal, oil, and natural gas. |
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| using natural resources in a way that they exist for future generations. |
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| the process in which farmland becomes less productive because the land is degraded. |
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| substances discharged into the air. |
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| the layer of air that surrounds Earth. It consits mainly of oxygen, nitrogen, and carbon dioxide. |
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| the careful management of energy so that less energy is used. |
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| energy released from the splitting of atoms. |
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