EAS205 Lecture Notes - Ahor, Chrysotile, Opata Language

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9914$ is the driving mechanism behind air quality changes. Human input varies from 35 million to 180 million tons per year. Commercial term for fibrous minerals used in heat-resistant fabrics. Accounts for over 90% of the uses of asbestos. Strongest of the asbestos fibers but brittle, very fine needles. Usually found in combination with chrysotile in pipes and sheeting. Occasionally found with amosite or chrysotile in pipe and boiler wrap. 5-10 % of commercial use historically much higher. Ch4 rice paddies, cattle and high altitude aircraft. Reacts with sunlight to produce tropospheric o3. Can react with water vapour hno3. 1970"s research indicated a direct link between stratospheric ozone depletion and increased cfc production. Controls the creation, emission and elimination of substances that could harm the ozone layer. Total phase out of cfcs and associated halogens is projected to. Reduced production and importation of cfcs by 85% since 1989. Estimated 130,000 metric tonnes of cfcs still in use.

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