About Global Warming

I guess you might already heard about "global warming".
But do you know what are the factors causing global warming?
Do you ever heard about the complications from global warming?
Have you noticed that in these recent years,
many parts of the earth's continents being suffered and attacked by the dramatic attacking disasters like tsunami, tornadoes, earthquakes, floods,snowstorms etc...?

Rainbow society hopes you could join us to concern about our earth's future.
Please join us and learn/know more about Global warming . Together, we COOL our earth.
To cool our earth?
Do we need to be COOL?
LOL!!!!

What is global warming?
Well, global warming hrmmm...
according to MSN encarta;

Definition:

increase in world's temperatures: an increase in the world's temperatures, believed to be caused in part by the greenhouse effect

Global warming is the observed and projected increases in the average temperature of Earth's atmosphere and oceans.

The Earth's average temperature rose about 0.6° Celsius (1.1° Fahrenheit) in the 20th century


Temp. increase in the last 1'000 years
(graph from http://www.globalwarmingart.com/images/b/bb/1000_Year_Temperature_Comparison.png)

What causes global warming???

Cause 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 vapour, carbon dioxide (CO₂), methane and ozone. Greenhouse gases are those gases that contribute to the greenhouse effect (see below). The largest contributing source of greenhouse gas is the burning of fossil fuels leading to the emission of carbon dioxide.

The greenhouse effect

When sunlight reaches Earth's surface some is absorbed and warms the earth and most of the rest is radiated back to the atmosphere at a longer wavelength than the sun light. Some of these longer wavelengths are absorbed by greenhouse gases in the atmosphere before they are lost to space. The absorption of this longwave radiant energy warms the atmosphere. These greenhouse gases act like a mirror and reflect back to the Earth some of the heat energy which would otherwise be lost to space. The reflecting back of heat energy by the atmosphere is called the "greenhouse effect".

The major natural greenhouse gases are water vapor, which causes about 36-70% of the greenhouse effect on Earth (not including clouds); carbon dioxide CO₂, which causes 9-26%; methane, which causes 4-9%, and ozone, which causes 3-7%. It is not possible to state that a certain gas causes a certain percentage of the greenhouse effect, because the influences of the various gases are not additive. Other greenhouse gases include, but are not limited to, nitrous oxide, sulfur hexafluoride, hydrofluorocarbons, perfluorocarbons and chlorofluorocarbons.

Global warming causes by greenhouse effect

Greenhouse gases in the atmosphere (see above) act like a mirror and reflect back to the Earth a part of the heat radiation, which would otherwise be lost to space. The higher the concentration of green house gases like carbon dioxide in the atmosphere, the more heat energy is being reflected back to the Earth. The emission of carbon dioxide into the environment mainly from burning of fossil fuels (oil, gas, petrol, kerosene, etc.) has been increased dramatically over the past 50 years.

Effects of global warming

There are two major effects of global warming:

• Increase of temperature on the earth by about 3° to 5° C (34° to 41° Fahrenheit) by the year 2100.

• Rise of sea levels by at least 25 meters (82 feet) by the year 2100.

More details about the effects of global warming :

Increasing global temperatures are causing a broad range of changes. Sea levels are rising due to thermal expansion of the ocean, in addition to melting of land ice. Amounts and patterns of precipitation are changing. The total annual power of hurricanes has already increased markedly since 1975 because their average intensity and average duration have increased (in addition, there has been a high correlation of hurricane power with tropical sea-surface temperature).

Changes in temperature and precipitation patterns increase the frequency, duration, and intensity of other extreme weather events, such as floods, droughts, heat waves, and tornadoes. Other effects of global warming include higher or lower agricultural yields, further glacial retreat, reduced summer stream flows, species extinctions. As a further effect of global warming, diseases like malaria are returning into areas where they have been extinguished earlier.

Although global warming is affecting the number and magnitude of these events, it is difficult to connect specific events to global warming. Although most studies focus on the period up to 2100, warming is expected to continue past then because carbon dioxide (chemical symbol CO₂) has an estimated atmospheric lifetime of 50 to 200 years. For a summary of the predictions for the future increase in temperature up to 2100

The above texts have partially been taken from Wikipedia.org and then adapted and complimented accordingly.

Try this: