Chronology of Ozone Depletion
1989
Confirmation
of ozone declines in mid-latitudes of Northern Hemisphere and in the
Arctic
Confirmation
of ozone declines in mid-latitudes of Northern Hemisphere and in the
Arctic1990Montreal Protocol amended to require a complete phase out of all ozone depleting
chemicals by 2000
Montreal Protocol amended to require a complete phase out of all ozone depleting
chemicals by 20001990U.S.
requirement for recycling of CFCÕs
U.S.
requirement for recycling of CFCÕs1992Discovery
of high levels of ClO over middle and high latitudes of Northern
Hemisphere
Discovery
of high levels of ClO over middle and high latitudes of Northern
Hemisphere1992Further
amendment of Montreal Protocol calling for an accelerated phase out by
ozone depleting chemicals
Further
amendment of Montreal Protocol calling for an accelerated phase out by
ozone depleting chemicals2100Time
needed for ozone layer to heal completely?
Time
needed for ozone layer to heal completely?