3. The main reasons for the ozone
hole are chlorofluorocarbons,
carbon tetrachloride, methyl
bromide and
hydrochlorofluorocarbons.
4. Manufactured chemicals, precisely
manufactured halocarbon solvents,
refrigerants, foam-blowing agents, and
propellants are the ozone-depleting
substances or ODS, known to be the main
cause of depletion of the ozone layer.
5. In 1987, the United Nations
Environment Programme (UNEP),
succeeded in forging an
agreement to freeze CFC
production at half of the 1986
levels. <br> Yes, by reducing the
continuous use of ozone depleting
chemicals, the size of the hole in
the ozone layer has reduced in
recent years.
6. The hole in the ozone layer — the portion of
the stratosphere that protects our planet from
the sun's ultraviolet rays — is continuing to
decrease. The hole over Antarctica had an
average area of 8.91 million square miles (23.2
million square kilometers).
