[New Zealand] According
to The National Institute of Water & Atmospheric Research (NIWA)
a gaping hole in the ozone layer over Antarctica appears to have shrunk
by about 20 percent. This year the hole peaked at about 24 million sq
km compared with 2003's 29 million sq km record-breaking size, say New
Zealand scientists.
The ozone layer lies about 9-19
miles above the earth, filtering harmful ultraviolet rays that can cause
skin cancer. Industrial chemicals containing chlorine and bromine used
in refrigerators and aerosols have been blamed for thinning the layer
because they attack ozone molecules, causing them to break apart.
NIWA scientist Stephen Wood cautiously
said, "We need to see smaller or less severe ozone holes over a
number of years before we can say for certain that [the] ozone [layer]
is recovering."
Under the 1987 Montreal Protocol,
more than 180 signatory states have committed to phasing out the use
of nearly 100 ozone-damaging substances, and hopefully this action is
actually bearing results in a recovering ozone layer.
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