Though the international 1987 agreement banning CFCs is visibly going successful, with the Earth’s ozone layer slowly recovering, it is to be marked that the recovery is happening in a changing atmosphere! And thus, it is unlikely to stabilize at pre-1980 levels! A new study at the University of Colorado, Boulder informs.
A larger than expected recovery of Ozone in the northern mid-latitudes in recent years has recovered to a larger extent than expected, the new study shows. It may be shifts in air temperatures and atmospheric transport that resulted in this increase. Natural variability like the 11-year solar cycle and an absence of major volcanic activity on Earth can be the influence too.
According to Betsy Weatherhead, a researcher with the Cooperative Institute for Research in Environmental Sciences, a joint institute of CU-Boulder and the National Oceanic and Atmospheric Administration,
In another 50 years CFCs won’t be the dominant factor controlling ozone… Instead, we think it will be factors like greenhouse gases, N2O and methane.
Via: Biology News