Ozone Healing
The level of ozone-depleting chemicals banned by the 1987 Montreal Protocol to stop the annual ozone hole from forming over the Antarctic is once again falling.
The illicit use of chlorofluorocarbons (CFCs) in the manufacture of polyurethane insulation foam in China, discovered in 2018, had caused the levels of atmospheric CFCs to be higher than expected. This caused the healing of the ozone layer to be slower than what scientists had predicted. But now that China has reined in the use of those compounds, their levels in the atmosphere are once again declining.
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