¥1881 Discovery
of ozone layer in stratosphere
¥1928 Synthesis
of CFCÕs for use as a refrigerant
¥1950s Rapid
increase in use of CFCÕs
¥1974 Description
of ozone loss chemical reactions
¥1979 Ban
of CFC use in most aerosol cans in U.S.
¥1980s Growth
of CFC use worldwide
¥1985 Discovery
of Antarctic ozone hole
¥1987 Adoption of Montreal Protocol calling for a 50% reduction in use of CFCÕs by 1998