Disappearing ozone
"Since chlorine in the atmosphere has reached nearly constant levels, annual variations in temperature, which affect the rate of the chemical reactions, will be the dominant factor in determining differences in the magnitude of the ozone hole. Total recovery of the ozone hold back to levels observed before 1980 will take at least 50 years, and expected changes in climate, including a cooler stratosphere could cause a delay in the recovery of the ozone layer," said Hofman.
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