A new study suggests that the ozone chemical bans implemented by different countries have contributed in the slow effect of global warming. Researchers believe that if the ban wasn't implemented, the global temperature may be 0.1C warmer than now.

Researchers from the Institute for Environmental Studies in Amsterdam, Netherlands did a statistical analysis on the relationship between the rising temperatures and the atmosphere's rates of increase in greenhouse gas concentrations from 1880 to 2010.

Their analysis revealed that the changes in the rate of warming can be caused by certain human actions affecting greenhouse gas concentrations. They explained that when these emissions were reduced during the two world wars and the Great Depression, the rise in temperature also stalled. They further argued that the introduction of the 1987 Montreal Protocol that was signed by 46 countries had influenced global temperatures as well.

The aforementioned treaty had eradicated the use of chlorofluorocarbons (CFCs) that were used as spray can propellants and in refrigeration. While it had helped in the thinning of the ozone layer in Antarctica, it also had a warming impact as they are more powerful than carbon dioxide by 10,000 times and have a lasting effect of 100 years in the atmosphere.

According to BBC, there are several theories that try to explain why the rise in CO2 emissions and other gases were not mirrored in temperatures starting from the latter part of the 1990s. These include changes in solar output, the impact of the El Niño weather phenomenon, and China's preference to use coal.

In a separate report made earlier this year, it suggested that one of the causes is the long-term changes seen in the warming waters around the eastern Pacific region.

The study was published in the online journal Nature GeoScience.