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Feb 10, 2021, 11:00 am185 ptsGrist
In 2016, sensors began picking up an illegal gas billowing into the atmosphere from eastern China. The gas, CFC-11, was banned in 2010 under the Montreal Protocol — the international treaty to eliminate substances that wreck the Earth’s protective ozone layer. CFC-11 also warms Earth with 5,000 times the…
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