Scientist say that the chemicals responsible for the growing ozone hole remain in the atmosphere for 40 - 100 years. The greenhouse gas CO2 remains in the atmosphere even longer (thus it's effect will go on a long time after we stop or greatly reduce emissions). Fortunately, actions against the ozone hole problem were decisive and fairly early after detecting the problem. And by 2070, it's estimated it will be closed up.
Some people naively expect instant results from our changes, but that's simply not reality in a complex system. It took 60 years of human activity to create the problem and it's taking 80 years to completely resolve it. Isn't this a call for Global Warming action now?
http://www.livescience.com/environment/071019-ap-ozone-hole.html
http://www.theozonehole.com
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