Ozone-destroying chemical emissions on rise despite ban
Washington, May 17: Emissions of one of the chemicals that can cause hole in the ozone layer are on the rise, despite an international treaty that required an end to its production in 2010, a new study says.
What is even more troubling is that scientists are not sure at present why emissions of this gas are increasing.
This gas, Trichlorofluoromethane, or CFC-11, is a member of the family of chemicals most responsible for the giant hole in the ozone layer that forms over Antarctica each September.
Once widely used as a foaming agent, production of CFC-11 was phased out by the Montreal Protocol in 2010.
The new study, published in the journal Nature, documents an unexpected increase in emissions of this gas, likely from new, unreported production.
"We're raising a flag to the global community to say, 'This is what's going on, and it is taking us away from timely recovery from ozone depletion,'" said lead author of the paper Stephen Montzka, a scientist at National Oceanic and Atmospheric Administration (NOAA) in the US.
"Further work is needed to figure out exactly why emissions of CFC-11 are increasing and if something can be done about it soon," Montzka said.
For the study, scientists at NOAA and Cooperative Institute for Research in Environmental Sciences at University of Colorado, Boulder, in the US made precise measurements of global atmospheric concentrations of CFC-11.
The results showed that CFC-11 concentrations declined at an accelerating rate prior to 2002 as expected.
Then, surprisingly, the rate of decline hardly changed over the decade that followed. Even more unexpected was that the rate of decline slowed by 50 percent after 2012.
After considering a number of possible causes, Montzka and his colleagues concluded that CFC emissions must have increased after 2012.
This conclusion was confirmed by other changes recorded in NOAA's measurements during the same period, such as a widening difference between CFC-11 concentrations in the northern and southern hemispheres -- evidence that the new source was somewhere north of the equator.
Measurements from Hawaii indicate the sources of the increasing emissions are likely in eastern Asia, the study said.
More work will be needed to narrow down the locations of these new emissions, Montzka said.
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19-year-old girl in Belthangady who attempted suicide dies in Mangaluru hospital
Belthangady: A 19-year-old girl from Belalu village, who had attempted suicide at home by consuming poison, has reportedly died at a hospital in Mangaluru.
The deceased, Rama, was the daughter of Dinesh and Revathi Naik of Mayada Balemandikallu in Belalu village, Belthangady taluk, and a II PUC student at Vamapadavu College.
Rama’s attempt to commit suicide is being linked to personal matters, as she is known to have loved a youngster.
On the night of April 19, she reportedly consumed rat poison at her residence and was admitted to a hospital in Mangaluru for treatment. After 10 days of treatment, she died on April 30 after failing to respond to medical care.
A case has been registered at the Dharmasthala Police Station, and investigation is underway.
(Assistance for overcoming suicidal thoughts is available on the state’s health helpline 104, Tele-MANAS 14416.)
