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TRANSCRIPT
Global warming refers to the
increase of the earth's average
surface temperature, due to a
build-up of greenhouse gases in
the atmosphere.
What is global warming?
In 200 years, we will havereleased in the atmosphere, the
carbon that took nature 600 million years to trap
1850 1900 1950 2000
CO2
2005100005 000 bef. JC10 000 bef. JC
5 million250 million in 1
1 billion in 1800
3 billion in 1960
4 billion in 1975
5 billion in 1987
2 billion in 1930
9.5 billion in 2010
The world
population
is increasing
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
Climate-sensitive 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
Diseases (e.g. cholera) accompanying algal blooms become more frequent
Air QualityAn increase in the concentration of
ground-level ozone
Damage lung tissue
Harmful for those with asthma and other chronic lung diseases
Food supply
Rising temperatures and variable precipitation
Decrease the production of staple foods in many of the poorest regions
Increasing risks of malnutrition
Population displacement
Rising sea levels
Increase the risk of coastal flooding
(population displacement)
• More than half of the world's population now lives within 60km of the sea.
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
Measures 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
* 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
Measures on controlling the problem
• Citizens
* 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
Reduce, Reuse, Recycle
Use the "Off" Switch
Plant a Tree
Buy Energy-Efficient Products
Encourage Others to Conserve
OVERALL
If you care about …
The future
Vote Climatein 2011
Vote only for the politicians who will
act to reduce CARBON emissions
Otherwise the result will be . . .