global patterns and cycles

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greenhouse effect

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ice melting

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greenhouse gas

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​Sulfur hexafluoride (SF6) is an inorganic, colorless, odorless, non-flammable, extremely potent greenhouse gas, and an excellent electrical insulator

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biodigester

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carbon, nitrogen, and phosphorous cycles

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Chlorofluorocarbons (CFCs)

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All consumer and most other aerosol products made or sold in the U.S. now use propellants—such as hydrocarbons and compressed gases like nitrous oxide—that do not deplete the ozone layer. Aerosol spray cans produced in some other countries might still utilize CFCs, but they cannot legally be sold in the U.S.

Were used in Refrigerators and Air Conditioners.

 Nobel Prize in Chemistry 1995

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