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Until the 1980s, chlorofluorocarbons, or CFCs, and other man-made halogen compounds were used in refrigeration, aerosol sprays and numerous other applications throughout the world.
He said he expected the ozone hole to disappear by about 2060.
Until the 1980s, chlorofluorocarbons, or CFCs, and other man-made halogen compounds were used in refrigeration, aerosol sprays and numerous other applications throughout the world.
UV radiation breaks down these chemicals once they are in the stratosphere, releasing chlorine and bromine atoms, which then deplete ozone.
He said he expected the ozone hole to disappear by about 2060.
The model accurately reproduces the ozone hole area in the Antarctic stratosphere over the past 27 years. Using the model, the researchers predict that the ozone hole will recover in 2068, not in 2050 as currently believed.
The scientists predict the ozone hole will not start shrinking a lot until 2018. By that year, the ozone hole's recovery will make better time.
The ozone layer is no longer disappearing and could be back to full strength by the middle of this century, UN scientists have confirmed.
The phasing out of nearly 100 substances once used in products like refrigerators and aerosols has stopped the ozone layer being depleted further, although it is not yet increasing, according to a new United Nations report released last week.
It turns out that one of CFCs' most attractive features—their low reactivity— is key to their most destructive effects. CFCs' lack of reactivity gives them a lifespan that can exceed 100 years, giving them time to diffuse into the upper stratosphere.
Many scientists and environmentalists say reducing the “forgotten 50 percent” of pollutants will be faster, easier and substantially cheaper than cutting carbon dioxide, and could buy the world time in its climate clock race.
from wiki
CFCs' lack of reactivity gives them a lifespan that can exceed 100 years, giving them time to diffuse into the upper stratosphere. Once in the stratosphere, the sun's ultraviolet radiation is strong enough to cause the homolytic cleavage of the C-Cl bond.
New Univeristy of Waterloo study finds CFCs, not CO2, to be the cause of recent global warming.
Professor Lu also explains that the climate change crisis is over. Thanks to an international environmental treaty, the planet is no longer in peril. We have, in fact, begun a long cooling period that will bring Earth’s temperatures back to normal.
“I didn’t see any CO2 effect on temperature or ozone depletion over the South Pole from 1956 to 2008,” explained Dr. Lu, surprised at how totally different the real-world measurements were from those that the climate model predicted. The real-world measurements showed CO2 to be largely irrelevant – “the global warming on Earth’s surface between 1950 and 2000 is pretty much due to CFCs,” he concluded. “The models say that CO2 is a major greenhouse gas but the facts show otherwise.
Originally posted by Sinter Klaas
reply to post by C0bzz
Thanks
Now for the next part.
The claim that man made climate change was caused only by CFCs
"Most remarkably, the total amount of CFCs, ozone-depleting molecules that are well-known greenhouse gases, has decreased around 2000," Lu said. "Correspondingly, the global surface temperature has also dropped. In striking contrast, the CO2 level has kept rising since 1850 and now is at its largest growth rate."
In his research, Lu discovers that while there was global warming from 1950 to 2000, there has been global cooling since 2002. The cooling trend will continue for the next 50 years, according to his new research observations.
The discharge rates of halogens in aerosols and gases emitted from Mount Erebus between December 1986 and January 1991 were estimated by combining element-to-sulfur ratios on filter samples with SO2 output measured by COSPEC. The halogen and sulfur content of the gas vary in a quasi-cyclical pattern possibly because of a heterogeneous distribution of volatiles in the Erebus magmatic system. The emission rates of HF and HCl have increased twofold since 1986 reaching 6 and 13.3 Gg/yr, respectively, in 1991, making Erebus an important contributor of halogens to the Antarctic atmosphere.