Global Warming

Done By: Chong Chee Yuan

2P403

Agenda

What is Global Warming?

Causes of Global Warming

Effects of Global Warming

What can be done to prevent Global Warming

What is Global Warming?

Global warming is the continual rise in the average temperature of Earth's atmosphere and oceans.

Causes for Global Warming

Natural Causes: The release of methane gas from arctic tundra and

wetlands.

The methane gas is a gas with greenhouse effect, which can trap heat within the earth’s atmosphere.

The earth is going through a cycle of climate change which usually last for 40,000 years.

Volcano eruption

Produce CO2

Solar cycle and cosmic rays

Responsible for more than 14% of the observed warming

Causes for Global Warming(cont)

Manmade Causes: Pollution

The burning fossil fuels release CO2 which is a greenhouse gas. It is used for many purposes like cars and factories.

Deforestation

Plants are cut down due to developing the countries.

By doing so, plants that can photosynthesize and take in greenhouses gases would be greatly lessen.

Cause the amount of CO2 to be more.

Population

More people means more cars and development

More fossil fuels burned

More greenhouses gases released

Causes for Global Warming(cont)

Manmade Causes: Nitrogen Oxides from Farming

Farmers add nitrogen fertilizers to fertilize the plants, which release nitrogen oxide that can trap heat far more than carbon dioxide.

Refrigerator

Chlorofluorocarbons and Hydrochlorofluorocarbons used in refrigeration are also powerful greenhouse gases. They can trap far more heat than carbon dioxide.

Methane

More powerful than carbon dioxide

Landfill and leakage of methane from natural gas field

Clathrates are frozen chunks of ice and methane that rest at the bottom of the world’s oceans. When ice melts, the methane will be released.

Effects of Global Warming

Temperature Temperature would rise, making living on earth unbearable

Melting of glaciers Sea level rises and islands and maybe even low-lying

countries would sink below sea

Population of penguins dropping drastically

Precipitation increasing around the world Some areas would experience floods and monsoon, while

some would experience drought.

Dangerous Weather Patterns Severe drought and flooding

As agriculture depends very much on weather patterns, when the patterns change, our ability to produce food is dampened.

Effects of Global Warming(cont)

Some diseases will spread, such as malaria carried by mosquitoes.

Eco-system will change. Eg. due to global warming, sea ice melts. Polar bear would

not be able to hunt for fish and will die. Global warming plays a great role of the extinction of animals.

Decreased amount of freshwater When ice caps melt, the water would get mixed with the

seawater in the ocean and would not be drinkable.

Hurricanes and storms gets stronger. The ocean’s warm water vapour fuels hurricanes, and as

that water gets warmer the amount of evaporation increases, thus fuelling more powerful storm

What can be done?

Increase the energy efficiency of our cars, homes, and power plants .

Capture the carbon emitted by power plants and store it underground.

Produce more energy from nuclear, natural gas, and renewable fuels—solar, wind and hydroelectric.

Stop deforestation and soil degradation worldwide, while reforesting more areas.

Things that we can do as one person:

Replacing appliances and light bulbs with more efficient ones

Planning our automobile trips more carefully

Drive more fuel-efficient cars

In conclusion, just use the 3 Rs. Reduce, Reuse and Recycle.

Videos

http://www.youtube.com/watch?v=oJAbATJCugs

http://www.youtube.com/watch?v=bSjRM8qNUEQ