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The 1987 Montreal Protocol is often described as the most successful environmental treaty ever created. It has led to a steady global phaseout of chemicals that once damaged the ozone layer and increased risks such as skin cancer.
Research led by MIT has shown that cutting these ozone-depleting substances is allowing the ozone layer to slowly heal. (It could return to 1980 levels by as early as 2040, according to some estimates.) However, the agreement include...
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