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?

Deforestation

Greenhouse gases

Aerosols and soot

Industries

Vehicles

Solar variation

In 200 years, we will havereleased in the atmosphere, the

carbon that took nature 600 million years to trap

1850 1900 1950 2000

CO2

Have occurred in the past 20 years

13 of the hottest year ever recorded

CO2

CO2CO2

every hour

3 Species go extinct

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

How many Earths do we need ?

Environmental and Human Effects

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 . . .

Now, you know

Thank Youfor your attention