1. GLOBAL WARMING

2. Global Warming an average increase in the temperature of the atmosphere near the Earth ’ s surface and in the troposphere1, which can contribute to changes in global climate patterns an average increase in the temperature of the atmosphere near the Earth ’ s surface and in the troposphere1, which can contribute to changes in global climate patterns

3. Causes Burning of fossil fuels (Coal/Crude oil) Burning of fossil fuels (Coal/Crude oil) –Power plants  generate electricity –Transportation-----fuels for transports (E.g. LPG, kerosene, fuel oil) kerosene, fuel oil) –Industrial processes (E.g. manufacture of cement, steel, aluminium) cement, steel, aluminium)

4. Causes Other greenhouse gases emission Other greenhouse gases emission –Agriculture –Forestry –Other land uses –Waste management

5. Besides carbon dioxide, other gases such as methane, chlorofluorocarbons, nitrogen oxides and ozone also contribute to the greenhouse effect. Example : Using natural gas to cook CH 4 + 2O 2  CO 2 + 2H 2 O CH 4 + 2O 2  CO 2 + 2H 2 O

6. Greenhouse gases in the atmosphere ↓ Some infrared radiation is trapped ↓ Greenhouse effect Serious greenhouse effect Global Warming

7. How serious the problem is?...

8. Increase in greenhouse gases Concentration of greenhouse gases in the atmosphere is highly increasing by human activities Concentration of greenhouse gases in the atmosphere is highly increasing by human activities → Leads to the increasing seriousness of global warming

10. Global surface temperatures –increased about 0.6°C/century since the late19th century –increased to 2°C/century over the past 25 years

11. Increase in Global temperatures

12. Temperature difference between different parts of atmosphere troposphere temperatures (the lowest 8 kilometers of the Earth's atmosphere) collected since 1979 also indicate warming troposphere temperatures (the lowest 8 kilometers of the Earth's atmosphere) collected since 1979 also indicate warming Cooling effect in higher parts of the atmosphere: stratospheric temperatures have been decreasing Cooling effect in higher parts of the atmosphere: stratospheric temperatures have been decreasing

15. NOT globally uniform warming Warming parts: Warming parts: –North America –Eurasia Cooling parts: Cooling parts: –parts of the southeastern U.S.

17. Increasing temperature extremes Regions that have temperatures (1-3°C) warmer than the average: Regions that have temperatures (1-3°C) warmer than the average: –United States –Most of the Europe Regions that have temperatures (1-3°C) cooler than the average: Regions that have temperatures (1-3°C) cooler than the average: –Australia

18. Regional Temperatures

19. Sea level rising rising at an average rate of 1 - 2 mm/year over the past 100 years rising at an average rate of 1 - 2 mm/year over the past 100 years

20. Environmental and Human Effects

22. Direct Temperature Effects Increase in average temperature More extreme heat waves during the summer; Less extreme cold spells during the winter Harmful to those with heart problems, asthma, the elderly, the very young and the homeless

23. Extreme Events Extreme Events: Extreme Events: Heat waves; Cold waves; Storms; Floods and Droughts Heat waves; Cold waves; Storms; Floods and Droughts Global warming An increase in the frequency of extreme events More event-related deaths, injuries, infectious diseases, and stress-related disorders Extreme Events: Extreme Events: Heat waves; Cold waves; Storms; Floods and Droughts Heat waves; Cold waves; Storms; Floods and Droughts Global warming An increase in the frequency of extreme events More event-related deaths, injuries, infectious diseases, and stress-related disorders

24. Climate-sensitive diseases Increase the risk of some infectious diseases Increase the risk of some infectious diseases –[particularly that appear in warm areas; are spread by mosquitoes and other insects] –E.g. Malaria, dengue fever, yellow fever, encephalitis Algal blooms occur more frequently as temperatures warm (particularly in areas with polluted waters) Algal blooms occur more frequently as temperatures warm (particularly in areas with polluted waters) Diseases (e.g. cholera) accompanying algal blooms become more frequent

25. Air Quality An increase in the concentration of ground-level ozone Damage lung tissue Harmful for those with asthma and other chronic lung diseases

26. Food supply Rising temperatures and variable precipitation Decrease the production of staple foods in many of the poorest regions Increasing risks of malnutrition

27. Population displacement Rising sea levels Increase the risk of coastal flooding (Necessitate population displacement) More than half of the world's population now lives within 60km of the sea. More than half of the world's population now lives within 60km of the sea. Most vulnerable regions: Nile delta in Egypt, the Ganges- Brahmaputra delta in Bangladesh, many small islands, such as the Maldives, the Marshall Islands and Tuvalu. Most vulnerable regions: Nile delta in Egypt, the Ganges- Brahmaputra delta in Bangladesh, many small islands, such as the Maldives, the Marshall Islands and Tuvalu.

28. UV Exposure (Australia) Skin Cancer Skin Cancer –an abnormal growth of skin tissues. Premature aging Premature aging –make the skin thick, wrinkled, and leathery –make the skin thick, wrinkled, and leathery Cataracts Cataracts –No longer have transparent lenses in their eyes

29. UV Exposure (Australia) Other Eye Damages Other Eye Damages –Skin cancer around the eyes –Degeneration of the yellow spot Suppression of Immunity Suppression of Immunity –Overexposure to UV radiation  suppress proper functioning of the body's immune system and natural defenses of skin –UV-B radiation weakens the immune system  increases the chance of infection and disease

30. Measures on controlling the problem Government Government * set some laws to limit the amount of pollutants produced by factories * set some laws to limit the amount of pollutants produced by factories * develop the skills of using renewable fuels, e.g. solar energy, wind energy * develop the skills of using renewable fuels, e.g. solar energy, wind energy

31. * encourage the factories to replace fossil fuels by renewable fuels, which would not cause environmental pollution * encourage the factories to replace fossil fuels by renewable fuels, which would not cause environmental pollution * carry out energy saving scheme → reduce the pollution produced by burning fossil fuels * carry out energy saving scheme → reduce the pollution produced by burning fossil fuels * build more plants → reduce the pollutants e.g. CO 2 * build more plants → reduce the pollutants e.g. CO 2 Measures on controlling the problem

32. Citizens Citizens * reduce the use of plastic bags → as burning plastic emit CH4 * reduce the use of plastic bags → as burning plastic emit CH4 * recycle the resources, e.g. plastic * recycle the resources, e.g. plastic * reduce the use of sprays → as CFCs would be emitted out * reduce the use of sprays → as CFCs would be emitted out

33. Measures on controlling the problem * reduce the use of air-conditioner, which will emit CFCs * use public transportation instead of private cars → reduce the pollutants emitted by cars

34. Sources http://www.who.int/globalchange/climate/en/ http://www.who.int/globalchange/climate/en/ http://www.who.int/globalchange/climate/en/ http://resources.emb.gov.hk/envir- ed/text/globalissue/e_m2_2_6.htm http://resources.emb.gov.hk/envir- ed/text/globalissue/e_m2_2_6.htm http://resources.emb.gov.hk/envir- ed/text/globalissue/e_m2_2_6.htm http://resources.emb.gov.hk/envir- ed/text/globalissue/e_m2_2_6.htm http://epa.gov/climatechange/effects/index.html http://epa.gov/climatechange/effects/index.html http://epa.gov/climatechange/effects/index.html http://www.tchps.edu.hk/greenweb/greenMaind GMsg5.htm http://www.tchps.edu.hk/greenweb/greenMaind GMsg5.htm http://www.tchps.edu.hk/greenweb/greenMaind GMsg5.htm http://www.tchps.edu.hk/greenweb/greenMaind GMsg5.htm http://www.ncdc.noaa.gov/oa/climate/globalwar ming.html http://www.ncdc.noaa.gov/oa/climate/globalwar ming.html http://www.ncdc.noaa.gov/oa/climate/globalwar ming.html http://www.ncdc.noaa.gov/oa/climate/globalwar ming.html

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