Scientists uncover likely cheating on ozone treaty

Scientists uncover likely cheating on ozone treaty

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The decline in the atmosphere of an ozone-depleting chemical banned by the Montreal Protocol has recently slowed by half, suggesting a serious violation of the 196-nation treaty, researchers revealed Wednesday. Measurements at remote sites — including the government-run Mauna Loa Observatory in Hawaii — of the chemical, known as CFC-11, point to East Asia as the source or renewed production. “We show that the rate of decline of atmospheric CFC-11 was constant from 2002 to 2012, and then slowed by about 50 percent after 2012,” an international team of scientists concluded in a study.