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When scientists discovered an ozone hole over Antarctica in the mid-1980s, countries around the world began phasing out the use of ozone-destroying chlorofluorocarbons (CFCs). A new class of ozone-friendly molecules called hydrofluorocarbons (HFCs) replaced them. A new study in the Proceedings of the National Academy of Sciences finds HFCs could become a significant factor in future global warming. [Source: Christian Science Monitor]
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