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Climate Change and Ozone Loss G. Tyler Millers Living in the Environment 14 th Edition Chapter 21 G. Tyler Millers Living in the Environment 14 th Edition.

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Presentation on theme: "Climate Change and Ozone Loss G. Tyler Millers Living in the Environment 14 th Edition Chapter 21 G. Tyler Millers Living in the Environment 14 th Edition."— Presentation transcript:

1 Climate Change and Ozone Loss G. Tyler Millers Living in the Environment 14 th Edition Chapter 21 G. Tyler Millers Living in the Environment 14 th Edition Chapter 21

2 Key Concepts Changes in Earths climate over time Factors affecting climate Possible effects of global warming Adapting to climate change Human impacts on the ozone layer Protecting and restoring the ozone layer

3 Past Climate Changes Past global temperatures Recent trends in global temperatures

4 The Greenhouse Effect Greenhouse effect Greenhouse gases (Refer to Table 21-1 p. 464)

5 Projecting Future Changes in Earths Climate Climate models Apparent influence of human activities Could be natural changes Modeling from the 1990 Modeling from the 1990

6 Climate Change and Human Activities Increased use of fossil fuels Deforestation Global warming Melting icecaps and glaciers Rising sea level Planet in Peril – Sea Level Rise Planet in Peril – Sea Level Rise

7 Factors Affecting the Earths Temperature Changes in solar output Changes in Earths albedo Moderating effect of oceans Clouds and water vapor Air pollution

8 Some Possible Effects of a Warmer World

9 Possible Benefits from a Warmer Atmosphere Less severe winters More precipitation in some dry areas Less precipitation in some wet areas Increased food production in some areas Expanded population and ranges of some species Less severe winters More precipitation in some dry areas Less precipitation in some wet areas Increased food production in some areas Expanded population and ranges of some species Solutions: Dealing with the Threat of Climate Change Options Do nothing Do more research Act now to reduce risks Precautionary principle

10 Removing CO 2 from the Atmosphere Reducing Greenhouse Gas Emissions Kyoto Treaty (1997) Other reductions in CO 2 U.S. withdraws from Kyoto Treaty (2001) Capture and sequester

11 Loss of the Ozone Layer: Reasons for Concern Increased incidence and severity of sunburn Increase in eye cataracts Increased incidence of skin cancer Immune system suppression Increase in acid deposition Lower crop yields and decline in productivity Seasonal Ozone Layer Thinning at the Poles Ozone thinning (hole) Polar vortex Skin Cancer

12 Ozone Depleting Chemicals Chlorofluorocarbons (CFCs) Halons Methyl bromide Carbon tetrachloride Methyl chloroform Hydrogen chloride Ozone Depletion in the Stratosphere

13 Former Uses of CFCs Air Conditioners Refrigerators Spray cans Cleaners for electronic parts Sterilizing medical instruments Fumigants for granaries and cargo ships Air Conditioners Refrigerators Spray cans Cleaners for electronic parts Sterilizing medical instruments Fumigants for granaries and cargo ships Solutions: Protecting the Ozone Layer CFC substitutes Montreal Protocol Copenhagen Protocol


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