1. Global Warming Done By: Chong Chee Yuan 2P403

2. Agenda  What is Global Warming?  Causes of Global Warming  Effects of Global Warming  What can be done to prevent Global Warming

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

4. 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

5. 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

6. 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.

7. 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.

8. 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

9. 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.

10. Videos  http://www.youtube.com/watch?v=oJAbATJCugs http://www.youtube.com/watch?v=oJAbATJCugs  http://www.youtube.com/watch?v=bSjRM8qNUEQ http://www.youtube.com/watch?v=bSjRM8qNUEQ