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Tag: ozone

Illegal emissions threaten to undermine UN's optimistic ozone report

Illegal emissions threaten to undermine UN's optimistic ozone report

Science
Nov. 8 (UPI) -- Despite news reports of an improving ozone layer, uncertainty over the impacts of illegal chlorofluorocarbon emissions threatens to undermine the longterm success of the Montreal Protocol. Earlier this week, the United Nations issued a press release confirming the Earth's ozone layer continues to heal. The release called the news a "ray of hope" in the wake of urgent warnings about the risks of global warming. But the report itself revealed serious concerns -- concerns parties to the Montreal Protocol are discussing this week at meetings in Quito, Ecuador. Last year, reports revealed a surprising uptick in CFC-11 emissions, an ozone-depleting gas banned under the Montreal Protocol. Followup investigations suggested the Chinese foam industry is responsible for the rise in C...
Ozone hole above Antarctica could be repaired by 2060

Ozone hole above Antarctica could be repaired by 2060

Technology
Amid all the bad news about the environment there is one chink of light - the Earth's ozone layer is healing, scientists say. And the good news includes the huge hole above Antarctica, which is expected to completely vanish by the 2060s.According to a UN report, the upper layer of ozone over the northern hemisphere will be repaired by 2030, and the damage over the southern hemisphere will be back to normal by the middle of the century.The ozone layer's increasing health has been put down to the 1987 Montreal Protocol - an international treaty banning ozone-depleting chemicals, including chlorofluorocarbons (CFCs), alongside new technology. Image: The banning of CFCs has helped to repair the ozone hole above Antarctica ...
Ozone hole mystery: China insulating chemical said to be source of rise

Ozone hole mystery: China insulating chemical said to be source of rise

Science
Cut-price Chinese home insulation is being blamed for a massive rise in emissions of a gas, highly damaging to the Earth's protective ozone layer. The Environmental Investigations Agency (EIA) found widespread use of CFC-11 in China, even though the chemical was fully banned back in 2010. Scientists have been extremely puzzled by the mysterious rise in emissions. But this report suggests the key source is China's home construction industry. Just two months ago, researchers published a study showing that the expected decline in the use of CFC-11 after it was completely banned eight years ago had slowed to a crawl. There were suspicions among researchers that new supplies were being made somewhere in East Asia. Rumours were rife as...
Ozone layer recovery could be delayed by 30 years

Ozone layer recovery could be delayed by 30 years

Science
Rising global emissions of some chlorine-containing chemicals could slow the progress made in healing the ozone layer.A study found the substances, widely used for paint stripping and in the manufacture of PVC, are increasing much faster than previously thought.Mainly produced in China, these compounds are not currently regulated. Experts say their continued use could set back the closing of the ozone hole by up to 30 years. Scientists reported last year that they had detected the first clear evidence that the thinning of the protective ozone layer was diminishing. Media playback is unsupported on your deviceThe Montreal Protocol, which was signed 30 years ago, was the key to this progress. It has progressively helped governments phase out the chlorofluorocarbons and the hydrochlorofluoro...
Unregulated chemicals may be stunting ozone recovery, new study suggests

Unregulated chemicals may be stunting ozone recovery, new study suggests

Science
June 27 (UPI) -- According to new research in England, several unregulated chemicals may be delaying the recovery of the ozone.The depletion of the ozone in the 1970s and 80s was caused by the proliferation of chlorofluorocarbons, chlorine derivatives used in aerosol cans, refrigerators and many other products and appliances. After the 1987 passage of the Montreal Protocol, the first treaty unanimously ratified by all members of the United Nations, CFCs were almost entirely phased out.A number of recent studies have detailed the slow but steady recovery of the ozone layer over the last three decades, but the latest study suggests there is room for improvement.Scientists at the University of Lancaster say atmospheric concentrations of dichloromethane, a short-lived, ozone-depleting substanc...