![]() The twin papers indicate that efforts to address the first known substantive violation of the international treaty tasked with ensuring stratospheric ozone layer recovery, known as the Montreal Protocol, are working. Results showing a global emission decrease in CFC-11, by a team of scientists from the United States, including from NOAA and CIRES, the United Kingdom and Australia, as well as a companion regional analysis by a second international team showing a decline in emissions from eastern Asia, were published in the journal Nature. The abrupt turnaround was detected by both NOAA's global monitoring network and an independent global sampling network, the Advanced Global Atmospheric Gases Experiment (AGAGE), funded in part by NASA. New analyses of global air measurements show that five years after an unexpected spike in emissions of the banned ozone-depleting chemical chlorofluorocarbon CFC-11, emissions dropped sharply between 20. ![]() A 2018 discovery posed the first real test of the Montreal Protocol.
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