A crooked industry in China has been releasing ozone-depleting chemicals into Earth’s atmosphere for years. Now, many of the culprits have been exposed.
CFC-11, an illegal chemical used to make foam insulation used in homes and buildings, has been banned globally for decades. But scientists spotted an uptick in the chemical’s abundance in the air since 2012, meaning its overall decline has slowed. Researchers concluded in May that there must be a new source of these pollutants.
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