THE protective ozone layer in the Earth's upper atmosphere has stopped thinning and should largely be restored by mid-century thanks to a ban on harmful chemicals, UN scientists say.
The Scientific Assessment of Ozone Depletion 2010 report says a 1987 treaty that phased out chlorofluorocarbons - substances used in refrigerators, aerosol sprays and some packing foams - had been successful.
Ozone provides a natural protective filter against harmful ultraviolet rays from the sun, which can cause sunburn, cataracts and skin cancer as well as damage vegetation.
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