Although the effects of global warming and climate change seem to be getting worse from day to day, we also have good news. After performing a research at the Goddard Space Flight Center, NASA researchers have discovered the ozone layer hole has started recovering. This has been possible thanks to the lower levels of chlorofluorocarbons (CFCs) in the atmosphere, which destroyed the ozone.
The ozone layer hole is not growing anymore
NASA performed a series of measurements in the atmosphere, and discovered the chlorine levels significantly decreased. This means the global efforts haven’t been in vain, after the authorities have banned the production of manmade chlorine products. After comparing the 2005 measurements with the ones in 2016, researchers noticed a decrease of 20 percent of these chemicals.
When researchers discovered the presence of the ozone layer hole, they also spotted chlorine molecules around it. Even if they measured few of them, they still found a way to detect its presence. Once the ozone was destroyed, this chlorine underwent a chemical reaction with methane, producing hydrochloric acid. This gas is easier to measure, and also offers a clear image of the state of chlorine in the atmosphere.
This is given by the lower chlorine levels in the atmosphere
Nitrous oxide also played an important role in these measurements. By looking at the CFC levels and at those of nitrous oxide, researchers could also obtain a clear image of the chlorine situation. Therefore, by comparing all these parameters, they could predict the chlorine levels. They assumed the levels of the chemical must have decreased by 0.8 percent every year.
The decline of the ozone layer hole is a reality, and researchers assume it is given by the shortage of chlorine in the atmosphere. This means the global efforts have been worth it, and encourage environmentalists to continue fighting against the toxic chemicals.