Reducing methane, a potent greenhouse gas, is considered a fast way to mitigate climate change, benefiting both air quality and warming. However, new research led by James Weber from the University of Reading complicates this view. While reducing methane can improve climate conditions, it may also hinder the recovery of the ozone layer.
As methane levels fall, more aggressive reactions from halocarbons and nitrous oxide—a byproduct of agriculture—occur, leading to increased ozone destruction. Models indicate that deep cuts in methane will cause ozone levels to drop by about 2% by 2100, which could increase the area exposed to harmful UV radiation by 30-35% by 2070. This intensifies health risks, including skin cancer.
The research underscores the successful recovery of the ozone layer influenced by the Montreal Protocol’s phasing out of harmful chemicals. While methane reduction remains crucial, it’s important to consider the implications for ozone-depleting gases in policy discussions. The findings assert that methane reduction should be pursued, but in conjunction with strategies addressing these other gases.
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