ADLib Glossary (M)

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The Montreal Protocol Agreement

A conference held in Montreal in 1986 by the United Nations Environmental Programme led to an international agreement (including most of the developed countries) to restrict the consumption and production of substances believed to damage the ozone layer. The original agreement aimed for a complete ban on production by the year 2000. The protocol is re-assessed and updated every two years and in recent years this phase-out date has been revised and brought forward to 1997.

Manufacturers are now seeking alternative chemicals and these (particularly HCFC's) are now being used in household white-goods and various other products. However, HCFC's are not a long term solution to the problem as these substances also have an ozone depletion potential although this is considerably less than CFC's. HCFC's will also be eventually phased out.

Ozone depleting substances covered by the Montreal Protocol include:

  • Group I CFC's (CFC-11 to 12, CFC-113 to 115)
  • Group II CFC's (CFC-13, CFC-111 to 112, CFC-211 to 217 and CFC-502)
  • Halons 1211, 1301 and 2402
  • Carbon Tetrachloride
  • 1,1,1 Trichloroethane
  • HCFC's
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