A recent study has claimed that it is the depletion of the ozone layer which is causing global warming. The study suggests that most of the scientists are considering greenhouse gases as a major contributor to global warming but refusing to even think about ozone depletion. The research further claims that their models fail to realize that energy in thermal radiation is not a function of amount; it is a function of frequency. Ultraviolet-B radiation has the frequency of infrared radiation 48 times as that of carbon dioxide. Thus, it has the potential to make the temperature of the absorbing body 48 times hotter which means 48 times the energy which can cause sunburn, skin cancer, and cataracts. The researcher further claimed that greenhouse gases do not absorb enough heat to be the primary cause of observed global warming.
The ozone layer remains 12 to 19 miles above Earth and prevents harmful radiation to reach earth. The ozone layer is getting depleted and destroyed, day by day, thanks to Chlorofluorocarbon gases (CFCs). It has been proven scientifically that one atom of chlorine can destroy 100,000 molecules of ozone. The depletion of ozone results in the less absorption of ultraviolet-B. Owing to this, more ultraviolet-B reaches to earth. It penetrates deep into oceans and is also absorbed very efficiently, causing warming of oceans.
The research further suggests that in 1993 when the increase of CFC in the atmosphere stopped then depletion in ozone also stopped which eventually stopped the increase in global temperature. As the depletion of the ozone started in the next few years, the oceans started warming, ice started to melt and sea-level started rising, but global temperatures did not change significantly from 1998 to 2013.
Another research suggested that there is a new Threat to the Ozone Layer. A researcher from University of East Anglia’s David Oram and the team has suggested that there is a growing danger to the ozone layer. Their research claimed that dichloromethane is a new threat to the ozone layer. This substance is widely used for a range of purposes like paint stripping to agricultural fumigation and the production of pharmaceuticals. It is found that dichloromethane became approximately 60% more abundant over the past decade.
Oram says that they are keen to discover the cause of the rapid increase in the concentration of dichloromethane. Research team further claimed that Asian countries like China, India etc are the significant emitter of dichloromethane with China alone may be responsible for around 50-60% of current global emissions of dichloromethane being the largest producer of PVC. Oram concludes that the main focus of the research is to highlight the gap in the Montreal Protocol that may need to be addressed in the future, particularly if atmospheric concentrations continue to rise.