The stratospheric ozone crisis created the conditions for global government intervention to achieve a specific goal, because the solution to the problem was scientifically evident. For science, the utility of stratospheric ozone was recognized, as was the cause of its disappearance. The proposed actions were obvious and simple. Their effect was quickly observed, confirming the scientific hypotheses and the results will be permanent.
On the other hand, research by Professor Qing-Bin Lu of the University of Waterloo has proved that CFC emissions account for variations in the amount of ozone, especially above the South Pole. The link is thus established between sun rays, ozone, Earth's temperature and Professor Lu's CRE theory. CFCs have effects on health through UV rays, but their effect on the climate must be added. These effects on climate change will be analyzed later. It is estimated that the ozone layer will return to its 1980 level by 2060. Substitutes for CFCs, such as HCFCs, will in turn be phased out by 2020 in industrialized countries and 2030 for others, even though China did not respect his commitment to the Montreal Protocol. The ozone layer is already recovering, and some believe that these actions will reduce the greenhouse effects on the climate more than the Kyoto Protocol.