2. What is Global Warming ?
An average increase in the
temperature of the Earth’s surface.

3. Causes
• Burning Of Fossil Fuels
-power plants  Generate Electricity
-Fuels For Transportation  Kerosene, Fuel Oil
-Industrial Process (e.g. manufacturer of
cement, steel..)

4. Causes
• Deforestation
• Water Vapor
• Green House Gases

5. Green House Effect
greenhouse gases in the
atmosphere that absorb thermal radiation
emitted by the Earth’s surface and, therefore,
act as
a blanket over the surface

6. Green House Effect

7. Green House Gases
• CO2
• Methane
• Nitrous Oxide
• CFC and Ozone

8. Ozone Depletion

9. How serious the problem is ?

10. Effects Of Global Warming
• Global surface temperature increased about
0.6◦ C/ Century.
• Increased 2◦C/Century over the past 25 years.

11. • In the 20th Century the temperature increased
on the surface of the earth with 0.74 C.
• The current level of Carbondioxide in the
atmosphere is 383 ppm. Many years ago it
was 280 ppm.
• 2007 is one of the top ten hot year after 1850.

12. Effects on Animals
• Polar Bear
• Penguin

13. Effects Of Global Warming
• Increase in average temperature
• More extreme heat wave during summer and
less extreme cold spells during the winter
• Harmful to those with heart problem, Asthma,
the elderly, the very young and homeless

14. Contd….
• 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)
Diseases (e.g. cholera) accompanying algal blooms
become more frequent

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

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

17. Extreme Events
• Extreme Events:
• 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

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

19. UV Exposure (Australia)
• Other Eye Damages
– Skin cancer around the eyes
– Degeneration of the yellow spot
• 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

20. 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.
• 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.

26. Measure on Controlling the problem
• Government
* 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

27. * 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
* build more plants → reduce the pollutants e.g. CO2

28. What we can do ?
* reduce the use of plastic bags → as burning plastic emit
CH4
* recycle the resources, e.g. plastic
* reduce the use of sprays → as CFCs would be emitted out
* reduce the use of air-conditioner, which will emit
CFCs
* use public transportation instead of private cars →
reduce the pollutants emitted by cars