May 31, 2013
CFCs, Not CO2, Key Driver Of Global Warming: Study
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redOrbit Staff & Wire Reports - Your Universe Online
Chlorofluorocarbons (CFCs) are to blame for global warming since the 1970s and not carbon dioxide, according to new research from the University of Waterloo published Thursday in the International Journal of Modern Physics B.
Qing-Bin Lu, a professor of physics and astronomy, biology and chemistry at the University of Waterloo, arrived at this conclusion after conducting an in-depth statistical analysis of CFCs, which are already known to deplete ozone.
"Conventional thinking says that the emission of human-made non-CFC gases such as carbon dioxide has mainly contributed to global warming. But we have observed data going back to the Industrial Revolution that convincingly shows that conventional understanding is wrong,” said Qing-Bin Lu, a professor of physics and astronomy, biology and chemistry in Waterloo´s Faculty of Science.
“In fact, the data shows that CFCs conspiring with cosmic rays caused both the polar ozone hole and global warming.”
"Most conventional theories expect that global temperatures will continue to increase as CO2 levels continue to rise, as they have done since 1850. What´s striking is that since 2002, global temperatures have actually declined — matching a decline in CFCs in the atmosphere,” Lu said.
“My calculations of CFC greenhouse effect show that there was global warming by about 0.6 °C from 1950 to 2002, but the earth has actually cooled since 2002. The cooling trend is set to continue for the next 50-70 years as the amount of CFCs in the atmosphere continues to decline.”
The study´s findings are based on exhaustive statistical analyses of observed data from 1850 up to the present time, along with Lu´s cosmic-ray-driven electron-reaction (CRE) theory of ozone depletion and his previous research into Antarctic ozone depletion and global surface temperatures.
“It was generally accepted for more than two decades that the Earth's ozone layer was depleted by the sun's ultraviolet light-induced destruction of CFCs in the atmosphere,” he said.
“But in contrast, CRE theory says cosmic rays — energy particles originating in space — play the dominant role in breaking down ozone-depleting molecules and then ozone.”
Lu said ongoing observations of cosmic ray, CFC, ozone and stratospheric temperature data over several 11-year solar cycles confirms his theory.
“CRE is the only theory that provides us with an excellent reproduction of 11-year cyclic variations of both polar ozone loss and stratospheric cooling,” he said.
“After removing the natural cosmic-ray effect, my new paper shows a pronounced recovery by ~20% of the Antarctic ozone hole, consistent with the decline of CFCs in the polar stratosphere.”
By proving the link between CFCs, ozone depletion and temperature changes in the Antarctic, Lu was able to draw nearly perfect correlation between rising global surface temperatures and CFCs in the atmosphere.
“The climate in the Antarctic stratosphere has been completely controlled by CFCs and cosmic rays, with no CO2 impact. The change in global surface temperature after the removal of the solar effect has shown zero correlation with CO2 but a nearly perfect linear correlation with CFCs - a correlation coefficient as high as 0.97."
Data recorded from 1850 to 1970, before any significant CFC emissions, show that CO2 levels increased dramatically as a result of the Industrial Revolution, although global temperatures, excluding the solar effect, remained nearly constant.
The conventional warming model of CO2 suggests the temperatures should have risen by 0.6°C over the same period, similar to the period of 1970-2002, Lu said.
The study´s analyses indicate the dominance of Lu´s CRE theory and the success of the Montreal Protocol on Substances that Deplete the Ozone Layer.
“We´ve known for some time that CFCs have a really damaging effect on our atmosphere and we´ve taken measures to reduce their emissions,” Lu said.
“We now know that international efforts such as the Montreal Protocol have also had a profound effect on global warming but they must be placed on firmer scientific ground.”
Terry McMahon, dean of the faculty of science at University of Waterloo, said Lu´s analysis underscores the importance of understanding the basic science behind ozone depletion and climate change.
“This research is of particular importance not only to the research community, but to policy makers and the public alike as we look to the future of our climate.”
Lu´s peer-reviewed paper also predicts that global sea level will continue to rise for some years as the hole in the ozone recovers and increasing amounts of ice melt in the polar regions.
“Only when the effect of the global temperature recovery dominates over that of the polar ozone hole recovery, will both temperature and polar ice melting drop concurrently,” says Lu.
Lu said his analysis provides a new understanding of the ozone hole and its relationship with global climate change, and offers superior predictive capabilities compared with the conventional sunlight-driven ozone-depleting and CO2 warming models.