A new study suggests that the ban on ozone depleting chemicals may have also impacted the rise in global temperatures. CFC gases were responsible for a massive hole in the ozone layer but they also had a powerful greenhouse effect.
The authors link a ban on their use to a "pause" or slowdown in temperature increases since the mid 1990s. The research is published in the journal Nature Geoscience.
The subject of a hiatus or standstill in global temperatures rises since 1998 has been the subject of intense debate among scientists, and it has been used as a key argument by some to show that the impacts of global warming have been exaggerated.
There have been a number of theories as to why the rise in emissions from CO2 and other gases has not been mirrored in temperatures since the late 1990s. These include increases in China’s use of coal, changes in solar output, and the impact of the El Nino weather cycle.
One report earlier this year suggested that it was caused by long-term changes in the warming of waters in the eastern Pacific.
Now this latest piece of research says that it has been caused by attempts to protect the ozone layer.
A team of researchers carried out a statistical analysis on the connection between rising temperatures and rates of increase in concentrations of greenhouse gases in the atmosphere between 1880 and 2010.
They concluded that changes in the warming rate can be attributed to specific human actions that affected greenhouse gas concentrations.