The decades-old international treaty that banned ozone-depleting substances has delayed the first ice-free Arctic summer by as much as 15 years.
, the two authors analyzed new climate model simulations and found that the changes implemented by the Montreal Protocol is delaying the first appearance of an ice-free Arctic summer by up to 15 years, depending on future carbon dioxide emissions. They compared the estimated warming from ODS’ with and without the Montreal Protocol under two scenarios of future carbon dioxide emissions from 1985 to 2050.
Both authors stressed the importance of remaining vigilant to atmospheric concentrations as the ozone layer is healing, especially due to a slight rise in ODS concentrations from 2010 to 2020. In 2016, an amendment to the Montreal Protocol (called the
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