Ozone layer ‘recovering’ 2006-06-22Posted by clype in Science.
The ozone layer is showing signs of recovering — thanks to the ban on 'CFCs'. It is nearly 20 years since harmful chlorine gases — then common in 'fridges and aerosols — were outlawed.
Ozone levels are now stable and may have even risen slightly over the past decade, scientists revealed.
Natural factors, such as a lack of volcanic eruptions, have also helped.
Ms.Betsy Weatherhead, who led the study, said:
'The ozone layer is responding to decreases in chlorine levels in the atmosphere due to the levelling off and decrease of "CFCs".'
However, the expert at the University of Colorado in Boulder, USA, warned:
'We're not "out of the woods" yet and the ozone recovery process still faces a number of uncertainties.'
She said other chemicals remained a danger, such as greenhouse gases from cars and nitrous oxide, produced by fertilisers.
- 'Ozone layer 'recovering'', Ananova, 2006-06-22