EC238 Chapter Notes - Chapter 20: Ozone Depletion

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10 Nov 2013
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Successive canadian federal governments have failed to introduce policies that stemmed the rise in emission. At the surface of the earth ozone is a pollutant produced when emissions of hydrocarbons and nitrogen oxides interact in the presence of sunlight. A variety of health problems and agricultural crop damages have been traced to elevated levels of surface ozone. Several decades ago scientific evidence began to appear that the ozone content of the atmosphere was showing signs of diminishing. Cfcs are in refrigerators and they break down the ozone. Baseline-and-credit system in a transferable emission system, credits may be given to polluters who document that they have a permanent reduction in their emissions of a pollutant. The credits can be used for compliance with regulations or sold to others if the source is abating more pollution than the total indicated by the credits. A challenge to this approach is verifying that reductions represent actual decreases in emissions from what previously existed.

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