MONTREAL PROTOCOL: ENVIRONMENT SAVER
In 1947, it was noticed that chloro flouro carbons (CFC's) like R-11, R-12 used extensively in refrigeration industry have ozone depletion potential (ODP).
CFCs are stable compounds in normal atmosphere. As explained above, when these rise to ozone layer. they decompose due to sunlight. The chlorine atom reacts with ozone and causes its depletion.
However, in the absence of confirmed proof, the scientific community for a long time did not press for elimination of the use of these gases.
After few preliminary discussions, in 1987, an agreement was signed by representatives of many countries in Montreal, Canada.
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