Our Planet, September 2007 Page: 4
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a walk through
1 974 19/5
Science suggests
the ozone layer
was formed
some 400 million
years ago.Nobel prize winners Molina and
Rowland discover that CFCs can
break down stratospheric ozone.1 ( , 71
-_ ..1928
Scientists
synthesize
CFCs.Scientists detect CFCs in atmosphere.
Scientists discover
that bromine, used
in fire-retarding
halons and agricul-
tural fumiganrts, is
a potent ozone-
depleting
substance.British Antarctic Survey team discovers
Antarctic ozone hole (7.3 million square
miles), marking the first evidence of
stratospheric ozone depletion.
Scientific research reveals stratospheric
ozone layer depletion has adverse
environmental and human health effects.1975
SC Johnson announces
corporate phaseout
of CFCs as aerosol
product propellants,
1976
United Nations Environment
Programme (UNEP) calls for an
international conference to dis-
cuss an international response
to the ozone issue.1987
Twenty-fo ur
countries sign
the Montreal
Protocol on
Substances That
Deplete the
Ozone Layer.
Mexico the
first to sign1978
U.S. bans non-essential uses of
CFCs as a propellant in some
aerosols (e.g., hair sprays,
deodorants, antiperspirants).
Canada, Norway, and Sweden fol-
low with a similar ban.1989
1981
UNEP acts on a propos-
al to develop a global
convention to protect
the ozone layerAll developed coun
tries that are parties
to the Montreal
Protocol freeze
production and
consumption of CFCs
at 1986 levels.London Amendment to the Montreal
Protocol adds controls on carbon
4 CELEBRATING 20 YEARS OF THE MONTREAL PROTOCOL tetrachlorid e and met hyl chloroform
and creates the Multilateral FundScience
1985
Action
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United Nations Environment Programme. Our Planet, September 2007, periodical, September 2007; Nairobi, Kenya. (https://digital.library.unt.edu/ark:/67531/metadc28527/m1/4/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .