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holes were first discovered in the 1980s, by19871i6 countries had signed the montreal protocol, banning gases and aerosols and fridges called cfcs, they were destroying the ozone letting through harmful ultraviolet rays that can cause problems like skin cancer. while the depletion of ozone is not a major cause of climate change, saving the ozone layer does have a positive knock on effect on global warning because some of the chemicals phased out our powerful greenhouse gases. the report says the ozone layer should recover to 1980 levels by roughly 2066, over the antarctic by 2045, the arctic and by 2040 for the rest of the world. there is the risk progress could be reversed, still, the un is optimistic, saying the sets a good example for other environmental action. as a battle for our planet �*s future isn't over yet. stay with us on bbc news, still to come: prince harry's highly—anticipated memoir