Global Warming and Green House effect .

1. Global Warming and Green House effect. By. Maci, Jessica

2. Definitions • Global Warming- an increase in the earth’s average atmospheric temperature that causes corresponding changes in climate and that may result from the greenhouse effect. • Greenhouse effect- natural heating caused by atmospheric gases trapping heat at Earth’s surface.

3. Global Warming • Climate change is among the most pervasive threats to the Earth today. We have the power to address its root causes and limit its impact on the planet. • Climate change, more commonly known as global warming, is caused by the emission of heat trapping gases produced by vehicles, power plants, industrial processes and deforestation. As these gases build up, they act like a big blanket, over-heating the planet and threatening our health, our economy and our environment.

4. Green House Effect • The green house effect is natural heating caused by gases in our atmosphere, trapping heat. • The greenhouse effect refers to circumstances where the short wavelengths of visible light from the sun pass through a transparent medium and are absorbed, but the longer wavelengths of the infrared re-radiation from the heated objects are unable to pass through that medium. The trapping of the long wavelength radiation leads to more heating and a higher resultant temperature.

5. Causes of Global Warming • Almost 100% of the observed temperature increase over the last 50 years has been due to the increase in the atmosphere of greenhouse gas concentrations like water vapor, carbon dioxide (CO2), methane and ozone. Greenhouse gases are those gases that contribute to the greenhouse effect. The largest contributing source of greenhouse gas is the burning of fossil fuels leading to the emission of carbon dioxide.

6. Cause • There are some natural greenhouse gases: water vapor, nitrous oxide, carbon dioxide, methane and ozone. However, over the past fifty years, production of carbon dioxide, nitrous oxide and methane has risen sharply, and a new type of chemical - the chlorofluorocarbon, or CFC - has been introduced as a refrigerant, solvent and aerosol propellant, but it is also a very powerful greenhouse gas, because it can trap a lot of radiation - one molecule of CFC is 12,000 to 16,000 times as effective at absorbing infra-red radiation as a molecule of carbon dioxide

7. Consequences, Effects-global warming The Earth's natural laws and boundaries have been affected by the ever-growing human population, and every so of ten the planet's natural reaction sends signals of stress and/or recovery. • As it is obvious by its name, Global Warming is a global phenomenon with a number of effects on the global level. Global warming has various effects, ranging from the effects to the atmosphere to the economical, environmental as well as the health life of human beings.

8. Greenhouse Effect

9. Consequences, Effects- Green house effect Increase of greenhouse gases concentration causes a reduction in outgoing infrared radiation, thus the Earth's climate must change somehow to restore the balance between incoming and outgoing radiation. This ¡§climatic change. ”i will include a is global warming” of the Earth's surface and the lower atmosphere as warming up is the simplest way for the climate to get rid of the extra energy. However, a small rise in temperature will induce many other changes, for example, cloud cover and wind patterns. Some of these changes may act to enhance the warming (positive feedbacks), others to counteract it

11. Bibliography • http://www.nature.org/initiatives/climatechange/about/ • http://www.ask.com/?o=0&l=dir • http://dictionary.reference.com/browse/global%20warming • http://www.solcomhouse.com/Greenhouect.gif • http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/grnhse.html • http://environment.about.com/z/js/o.htm • http://www.hko.gov.hk/wxinfo/climat/greenhs/e_grnhse.htm