Preface to the Primer
The Montreal Protocol on Substances that Deplete the Ozone Layer is an international agreement aimed at reversing the damage done to the stratospheric ozone layer that protects the earth from harmful solar ultraviolet radiation. Canada continues to be a leader on ozone protection among the more than 175 countries that are signatories of the Montreal Protocol.
Parties to the Montreal Protocol reached an important milestone on January 1, 1996, with all developed countries eliminating the production and importation of the most damaging ozone-depleting substances (the main ones being CFCs). This success was accomplished through the co-operation and the combined efforts of governments, industry, environmental groups and the scientific community. However, this achievement does not mean that Canada and the international community can afford to become complacent about ozone depletion.
Phase-out of the most damaging ozone-depleting substances (ODS) has recently begun in developing countries. Developed countries have already eliminated most ODSs and have adopted reduction and phase-out targets for the remaining ODSs still of concern. Much is still needed in the way of scientific research, development of alternative substances and technologies, technology transfer, and public education.
Encouraged by the progress that has been achieved, Canada has renewed its commitment to make ozone protection a top priority. This summary report describes why and how.
The report covers the history of our knowledge about ozone depletion, its causes, possible solutions, and what Canada is doing in response to the threat of ozone loss. It explains the disturbing potential consequences of ozone destruction, as well as the challenges Canada and other countries must face to fully support ozone protection programs.
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