1. 4B Au Yeung King 4B Chan Ka Shing 4B Ching Kwok Shu 4C Ng Shuk Yan Topic : Global Warming

2. Division of work:  4B Au Yeung King Evidence of global warming Causes of increasing greenhouse gases (including the pictures and the graphs)  4B Chan Ka Shing Consequences  4B Ching Kwok Shu Definition of global warming (including the graphs)  4C Ng Shuk Yan Solutions Difficulties encountered Power point making

3. Definition of global warming:  Increases in the average temperature of Earth's atmosphere and oceans  The Earth's average temperature rose about 0.6° Celsius in the 20th century

4.  Temperature increases of about 3° to 5° C by the year 2100 or soon afterwards. A 3°C or 5° Fahrenheit rise would likely raise sea levels by about 25 meters.

5. Evidence of global warming:  Global average temperature is increasing  The number of cold nights and days are increasing

6.  Ocean temperatures are increasing  T he extent of sea ice cover, glaciers and ice caps has been shirking

7. Mean cumulative specific mass balance of all reported glaciers (black line) and the reference glaciers (red line)

8.  The global average sea level has gone up

9. Causes of increasing greenhouse gases:  Burning of fossil fuels including coal, oil and natural gas 75% of human-induced carbon dioxide emission more in factories and power plants increasing use of cars  Deforestation burning→releases CO2 trees↓→ absorbing the extra amount ofCO2↓

10. Garbage treatment landfils methane (decomposes) incinerators CO2&nitrous (burning)  Agriculture rice growing & cattle rearing Population↑→Agriculture↑=more crops=releasing CO2↑(by burning organic waste &cattle breathing)& methane (by cattle during the digestive process &paddy growing) releases nitrous oxide(nitrogen fertilizers) change of land cover→CO2 is absorbed by trees↓  Garbage treatment

11.  Industrial activities CFCsHFCsPFCsSF6Nitrous oxides Foams, refrigeran ts &solvents ★★ Aluminum smelting & magnesiu m productio n ★★ Productio n of nylon ★

12. Consequences:  As ocean temperatures rise melting of continental glaciers ↑→rising sea levels will drown coastal low- elevation areas→the human living environment↓ water evaporates↑=rainfall↑ → floods, landslides and debris flows

13.  As atmospheric temperature increases the high-latitude spread of tropical diseases↑ evaporation↑+the wrong farming methods→the protection of a good semi-arid areas into semi-arid areas→desertification↑  Extinction of species the temperature near the polar regions↓→ many species↓

14. Solutions:  International cooperation the signing of the Kyoto Protocol →the emission of greenhouse gases↓ The ‘Bali Roadmap’ →a long-term global goal for emission reductions  Countries Reduce greenhouse gas emissions Engage in large-scale afforestation Develop in a sustainable way

15.  Individual effort The size of carbon footprint↓→greenhouse gases↓ can reduce the size of carbon footprint in some ways(at home, shopping,transport and travel)

16. Difficulties encountered:  Difficult to find the time to discuss  Difficult to find the examples to reflect global warming  Difficult to express in English

17. The End