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        Turning Down the Greenhouse Gases in Your Air Conditioning

        More than 150 countries approved an agreement to phase out the production and use of hydrofluorocarbons (HFCs). Used in air conditioning and refrigeration units, HFCs are heat-trapping chemicals that contribute to increasing global temperatures. John Upton, a senior science writer for Climate Central, breaks down the good and bad of the agreement.

        www.sciencefriday.com

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