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Study: Ozone-Killing Chemicals Traced to China

Scientists say they have pinpointed the source of a globally banned chemical that damages the Earth's protective ozone layer: China. In a report published Wednesday in the journal Nature, the scientists who monitor the planet's atmosphere say the recent rise in the emission of the ozone-depleting chemical CFC-11 has been traced to two provinces in eastern China. Any production and use of CFC-11 is a violation of the Montreal Protocol, a 1987 agreement that phased...

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