The document discusses global warming, highlighting its definition, history, causes such as fossil fuel combustion and deforestation, and greenhouse gas emissions. It outlines the serious effects, including polar bear extinction, glacier melting, and impacts on food supply and human health. Solutions suggested include government regulations, citizen actions to reduce pollutants, and promoting renewable energy sources.

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Global Warming
THARUMARAJA SAJARUPAN
Student ,
Department of Engineering Technology,
Faculty of Technology,
University of Ruhuna.
ENVIRONMENTAL SCIENCE

2. What is Global
Warming?
an average increase in the temperature of
the atmosphere near the Earth’s surface and
in the troposphere (1st layer), which can
contribute to changes in global climate.
patterns.
2

3. 3
Histroy of Global Warming.

4. 4

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

6. Causes of Global
Warming
5. Greenhouse gases
emission.
 – Agriculture
 – Forestry
 – Other land uses
 – Waste management
6. Population Increase.
7. Deforestation

7. Let we know some
Green house gases
Methone
(CH4)
Nitrous
Oxide(N2O)
Carbon
Dioxide (CO2)
Ozone
(O3)
Chlorofluoro
carbon (CFC)
Sulphur
Dioxide
(SO2)

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

9. What are the Effects of
Global Warming?
9

10. Polar Bear Extinction 10

11. Warmer waters and more hurricanes 11

12. Melting of
glaciers
An assessment of about
200,000 glaciers in the world,
some of which have been
monitored since the mid 19th
century, has found that about
two thirds of the current rate
of glacial melting is due to
human influences on the
climate.
12

13. Extreme Events
Heat waves; Cold waves; Storms; Floods
and Droughts. 13

14. Increased probability and intensity of
droughts and heat waves 14

15. Increased Temperature 15

16. Air Quality
An increase in the concentration of
ground-level ozone
↓
Damage lung tissue
↓
Harmful for those with asthma and
other chronic lung diseases
16

17. Food supply
Rising temperatures and variable
precipitation
↓
Decrease the production of staple
foods in many of the poorest
regions
↓
Increasing risks of malnutrition
17

18. 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.
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.
18

19. 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
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. How We Can Stop
Global Warming?
20

21. Contribution of Goverment to stop
Global Warming. 21
 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
 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

22. Contribution of Citizen to stop
Global Warming. 22
 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
 Plant Trees.
 Save Electricity.

23. Contribution of Citizen to stop
Global Warming. 23
 Spread awareness.
 Turn off your computer or the TV when
you’re not using it.
 Turn off the lights when you leave a room.
 Be Bulb Smart—Use CFLs
 Dress lightly when it’s hot instead of
turning up the air conditioning.
 Use Fuel efficient cars.
 Drive less, drive SMART Use a bicycle

24. 24

25. Reference :
https://www.national `
geographic.com/environment/global
warming/big-thaw/
https://www.slideshare.net/search/slid
eshow?searchfrom=header&q=gloabal+
warming

26. 26
Conclution.

27. Thanks!
Any questions?
27