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Greenhouse Effect.

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Introduction

GREENHOUSE EFFECT

Energy from the sun heats the earth’s surface, makes clouds and creates weather. Atmospheric greenhouse gases such as CO2 and clouds trap some of the outgoing energy like a great blanket. The greenhouse effect moderates temperatures and makes life possible on this small green planet. The threat of global warming may someday become a serious problem if the current trend of fossil fuel consumption continues.
In the last 300 years the concentrations of carbon dioxide alone has increased by more than 30%.Without adequate emission control policies and alternative energies to choose from this concentration will most likely double during this century. If the greenhouse effect continues to escalate many scientists believe we will reach a point of no return. High temperatures mean increased plant growth, more rain, more vegetable growth, more decay and more carbon dioxide. More carbon dioxide increases the greenhouse effect, the cycle continues and the planet "hot balls" into an inferno like Venus.

How can people prevent global warming?
The answer to this question is simple. All we have to do is stop consuming vast quantities of fossil fuels and start searching for renewable energy supplies. We need to explore alternative energy options such as wind ,water and solar energy. Of these options solar energy appears to have the greatest potential over the largest area. To avoid excessive global warming we can use the same principle that' s causing it. .That's right! The greenhouse effect is a fundamental method of trapping heat from the sun. High frequency radiation such as ultraviolet and visible light is allowed to pass through a glazing. Once the light is inside

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Middle

Energy from the sun heats the earth’s surface, makes clouds and creates weather. Atmospheric greenhouse gases such as CO2 and clouds trap some of the outgoing energy like a great blanket. The greenhouse effect moderates temperatures and makes life possible on this small green planet. The threat of global warming may someday become a serious problem if the current trend of fossil fuel consumption continues.
In the last 300 years the concentrations of carbon dioxide alone has increased by more than 30%.Without adequate emission control policies and alternative energies to choose from this concentration will most likely double during this century. If the greenhouse effect continues to escalate many scientists believe we will reach a point of no return. High temperatures mean increased plant growth, more rain, more vegetable growth, more decay and more carbon dioxide. More carbon dioxide increases the greenhouse effect, the cycle continues and the planet "hot balls" into an inferno like Venus.

How can people prevent global warming?
The answer to this question is simple. All we have to do is stop consuming vast quantities of fossil fuels and start searching for renewable energy supplies. We need to explore alternative energy options such as wind ,water and solar energy. Of these options solar energy appears to have the greatest potential over the largest area. To avoid excessive global warming we can use the same principle that' s causing it. .That's right! The greenhouse effect is a fundamental method of trapping heat from the sun. High frequency radiation such as ultraviolet and visible light is allowed to pass through a glazing. Once the light is inside the greenhouse and it strikes a non reflective surface the high frequency radiation is transformed into a low frequency heat radiation that can not pass back out through the glazing.

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Conclusion

The combustion of fossil fuel (oil, natural gas and coal) by heavy industry and other human activities, such as transport and deforestation, are the primary reasons for increased emissions of these gases.

Other factors slow the warming, but not to the same degree.

At the same time greenhouse gases such as CO2 and methane are increasing, so too is aerosol in the atmosphere, from human made sulphur emission. These small particles reflect back some of the sunlight and hence act to slow down the cooling.

However where carbon dioxide can remain in the atmosphere for 100 years, sulphate aerosols only last a few days and can be easily removed by rain (acid rain). Therefore they only temporarily mask the full effect of CO2.

In order to try and predict possible consequences of this warming for the future, research institutes use climate modelling to simulate the climate and oceans over many decades.

So far model simulations point to global temperature rises of approximately 3 degree C in the next 100 years, which doesn't sound much. Consider however that the difference between average global temperatures now and the last ice age (not strictly correct but sounds better!) some 20,000 years ago is only around 6 to 8C.

Climate models also predict changes in rainfall and continued rise in sea level. Sea level rises will be due to thermal expansion of the ocean along with the melting glaciers and mountain snow and ice. The best estimate is 50cm by 2100, but this will vary considerably with location. Think about Bangladesh where 37% of the land lies below 3 metres and the effect of storm surges.

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