What is Global Warming ?

An average increase in the temperature of the Earth’s surface.

Causes

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

cement, steel..)

Causes

• Deforestation • Water Vapor • Green House Gases

Green House Effect

greenhouse gases in theatmosphere that absorb thermal radiation

emitted by the Earth’s surface and, therefore, act as

a blanket over the surface

Green House Effect

Green House Gases

• CO2

• Methane

• Nitrous Oxide

• CFC and Ozone

Ozone Depletion

How serious the problem is ?

Effects Of Global Warming

• Global surface temperature increased about 0.6◦ C/ Century.

• Increased 2◦C/Century over the past 25 years.

• 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.

Effects on Animals

• Polar Bear• Penguin

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

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

An 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

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

• 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

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

• 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

UV Exposure (Australia)

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.

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

* 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

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

THANK YOU