Earth’s ozone layer on way to recovery, finds UN report, should mend by 2040

A United Nations-backed scientific panel has concluded that actions taken under the Montreal Protocol have successfully strengthened the Earth’s ozone layer, helping avoid global warming from 0.5 to 1 degrees Celsius by mid-century.

The Montreal Protocol is an 1989 international treaty aimed at regulating the production and use of chemicals that contribute to the depletion of the ozone layer.

The panel, in its assessment report, has said that a phase out of nearly 99 per cent banned ozone-depleting substances (ODS) — such as tropospheric chlorine and bromine — contributed significantly to the recovery of the ozone layer, decreasing human exposure to harmful ultraviolet (UV) rays from the sun….