-
discovery
The discovery of the hole in the ozone layer was over the antartic, after a champman's reaction was run to test the density of the atomsphere which became much slower then was predicted to be. -
Period: to
gradual decrease
Further investigation of the lack of ozone over the course of thirty years showed a staggering continuel decrease in the total amount of ozone reported. -
reducing the impact
A global agreement was lauched named the montreal protocol with the goal of decreasing the amount of damage dealt to the layer by one half with a dead line of the year 2000. -
changes to agreements
the agreements that were reached changed somtimes the last being during 1992 about the amount of halocarbons could be produced within products such as medical sprays, this will be in affect until the year of 2030.