ENV100Y5 Lecture Notes - Lecture 44: Montreal Protocol, Ozone Depletion, Precautionary Principle
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ENV100Y5 Full Course Notes
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Document Summary
It is challenging to respond to international problems like this. Very long time scale (long residents time - ex. Cfcs now in the atmosphere will stay for many years. Montreal protocol (1987) - international agreement to phase out production of ods (ozone depleting substances) Use of precautionary principle (if there is a chance that significant harm will be done, it is a moral imperative we do something to solve or mitigate it) Collaborative approach (included everyone affected by agreement) Today: 95% drop in production of ods. Ozone hole record size (2000), intensity (1993, 2006) By 2050 the ozone hole may disappear. Impacts of the montreal protocol on abundance of chlorine in the atmosphere. Chlorine does the damage; 1980 level: around 2050 the chlorine may drop. Impacts of the montreal protocol on ozone deficit in the atmosphere. Return of ozone mass deficit to 1980 values. There are still many questions to be resolved about ozone depletion.
