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(Lou)

Before we proceed on the further concerns, let us first tackle the meaning of Climate

Change and the other related terms that must be known, too.

What is Climate Change? Climate change is the statistical and lasting change in thedistribution of weather patterns ranging from decades to million of years. It may be a

change in average weather conditions or the distribution of events around that average.

Also, it may happen only on a specific region, but also in the entire world.

Climate change is the abnormality that could happen at places. Good example is the

high-range temperature that occurs during BER-months. This is quite different from

what we used to experience, short days and cold nights. Also the flashfloods happening

during the times that sun was to come out. This has greatly affected people on adapting

especially the farmers who were expecting good rice production.Within specific references, Global Warming refers to the increase of surface

temperature of earth, while Climate Change includes global warming and everything

else that increasing greenhouse gas amounts will affect.

In using technological equipment such as refrigerators, air-conditioners, etc., the risk of

increasing the Green House Effect may happen. Green House Effect is the trapping

mechanism of earth which includes the function of taking in carbon dioxide and

releasing out the excess of it. But in the present case, influenced by much pollutants

brought by technology, the function of releasing the excess could not seem to happen.In short, carbon dioxide molecules that were supposed to escape from earths surface

were trapped causing the temperature to increase abruptly.

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(Lora)

CAUSES OF CLIMATE CHANGE

Most experts agree on the fact that the main cause of the rapid increase of climate is the

expansion of the Green House Effect.

Certain gases in the atmosphere block heat from escaping. Long-lived gases, remainingsemi-permanently in the atmosphere, which do not respond physically or chemically tochanges in temperature, are described as "forcing" climate change whereas gases, suchas water, which respond physically or chemically to changes in temperature are seen as"feedbacks."

Some of the gases that contribute to green house effect are as follows:

Water Vapor which is the most abundant greenhouse gas. Carbon Dioxide which is a

minor but very important component of the atmosphere. Methane which is a

hydrocarbon gas produced both by natural sources and human activities. On a

molecule-for-molecule basis, methane is a far more active greenhouse gas than carbon

dioxide, but also one which is much less abundant in the atmosphere. Nitrous Oxide is

a powerful greenhouse gas produced by soil cultivation practices. Chlorofluorocarbons

or CFCs are synthetic compounds of entirely of industrial origin used in a number of

applications, but now largely regulated in production and release to the atmosphere by

international agreement for their ability to contribute to destruction of the ozone layer.

They are also greenhouse gases.

As quoted by Sierra Club: "The coal and oil that have fueled the growth of industrialized

countries have also fueled the warming of the Earth. Roughly 75% of the man-made global

warming pollution currently in the atmosphere comes from industrialized nations. Developing

countries, especially those with rapid population growth, promise to worsen this problem as they

too develop, using the model of wasteful, energy-intensive Western economies."

On Earth, human activities are changing the natural greenhouse. Over the last centurythe burning of fossil fuels like coal and oil has increased the concentration of

atmospheric carbon dioxide. Without trees to inhale carbon dioxide and produceenough oxygen for us, this change will continue and may bring another batch of morehazardous phenomena.

It's reasonable to assume that changes in the sun's energy output would cause theclimate to change, since the sun is the fundamental source of energy that drives ourclimate system.

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Indeed, studies show that solar variability has played a role in past climate changes. Forexample, a decrease in solar activity is thought to have triggered the Little Ice Agebetween approximately 1650 and 1850, when Greenland was largely cut off by ice from1410 to the 1720s and glaciers advanced in the Alps.

But several lines of evidence show that current global warming cannot be explained bychanges in energy from the sun:

y Since 1750, the average amount of energy coming from the Sun either remainedconstant or increased slightly.

y If the warming were caused by a more active sun, then scientists would expect tosee warmer temperatures in all layers of the atmosphere. Instead, they haveobserved a cooling in the upper atmosphere, and a warming at the surface and inthe lower parts of the atmosphere. That's because greenhouse gases are trapping

heat in the lower atmosphere.

y Climate models that include solar irradiance changes cant reproduce theobserved temperature trend over the past century or more without including arise in greenhouse gases.

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(Anne)

EVIDENCES OF CLIMATE CHANGE

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(Unknown)

CURES

(Unknown)

SUMMARY

(Eman)

CONCLUSION

hasten