L01 Slide 49 Greenhouse Gas Emissions in Canada 18 Megatonnes of carbon dioxide

L01 slide 49 greenhouse gas emissions in canada 18

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L01 Slide 49 Greenhouse Gas Emissions in Canada 18% Megatonnes of carbon dioxide equivalent Recession Source:
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L01 Slide 50 Projection of GHG Emissions in Canada Source:
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L01 Slide 51 Effects of Climate Change More extreme weather Heat waves & drought Loss of biodiversity Ocean acidification Changes in precipitation patterns Stronger and more intense hurricane Sea level will rise 1-4 feet by 2100 Arctic likely to become ice-free
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L01 Slide 52 Global Warming (Table B.1) Appendix B1, DFES Book
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L01 Slide 53
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L01 Slide 54 Ozone Layer Ozone production: Mainly in the stratosphere layer of the atmosphere with highest concentration in 30 to 35 km from the earth ( ~ 8 ppm) It absorbs most of the harmful UV radiation, preventing it from reaching the earth’s surface 10 - 50 km
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L01 Slide 55 Ozone depletion refers to the thinning of the ozone layer Chemicals, known as ozone-depleting substances (ODS), are the major causes of ozone depletion The best-known and most abundant of the ODS are chlorofluorocarbons (CFCs) A single atom of chlorine from a CFC can destroy 100,000 or more molecules of ozone Stratospheric Ozone Depletion
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L01 Slide 56 Antarctic Ozone Hole Recipe for an ozone hole: 1. High levels of chlorine and bromine 2. Very cold temperature 3. Sunlight Source: Source: NASA How will the climate change affect the Antarctic ozone hole?
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L01 Slide 57 NASA Evaluates New Threats to Earth’s Ozone Layer
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L01 Slide 58 Montreal Protocol First plan agreed on in 1987 to phase out CFCs Started to phase out HCFCs in 2013 Successful! Amended in 2016 to phase out HFCs CFCs e.g. Freon, R11, R12 HCFCs e.g. R21, R22 HFCs e.g. R-134a New alternatives e.g. HFO-124yf
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L01 Slide 59 Fluorocarbons or brominated compounds are “in - kind” options Non-fluorocarbon and non-brominated options are “not -in- kind” (NIK) Montreal Protocol Alternatives and Substitutes for ODSs Source: “Not -in- kind alternatives to high global warming HFCs”, Centre for climate and Energy Solutions
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L01 Slide 60 Ozone Layer Depletion (Table B.2) Appendix B, DFES Book
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  • Fall '09
  • MURRAYTHOMSON

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