Global Green House Effects
The greenhouse effect is an increase in the atmospheric temperature causedby increasing amounts of greenhouse gases. These gases act as a heat blanketinsulating the Earth's surface absorbing and trapping heat radiation which normallyescapes from the earth. They include carbon dioxide, water vapour, methane,nitrous oxide, CFC's, and other halo-carbons. The earth's atmosphere goes through two processes constantly. Global coolingis the first process. This process uses the clouds which cover 60% of the earth'ssurface to reflect 30% of the solar radiation. It also uses a sulfate haze, which is formed by sulfur dioxide from industrial sources that enter the atmosphere and react with compounds to form a high-level aerosol. These cool the atmosphere by blocking us from direct contact with the sun. The reflection of the sunlight is referred to as planetary albedo and contributes to the overall cooling. The second is the warming process. This is when light energy comes throughthe atmosphere and is absorbed by Earth and transformed to heat energy at the planet's surface. The infrared heat energy then radiates upward into space. There the greenhouse gases found naturally in the troposphere absorb so
In order to control the effects of global warming we must first admit that it's occurring, then take steps to end it. If ocean waters rise several feet, whole beaches could wash away. This is because the forests are being cut and burned adding 1 to 2 billion tons annually to the 6 billion tons of carbon already from industrial processes. A climactic change will lead to variations in temperature. In the southern hemisphere, the warming is the greatest over Australia, southern south Africa, the southern tip of south America, and the area of Antarctica near Australia. Water vapour is also a major factor in what has been called the "super-green house effect" in the tropical Pacific ocean. Scientists expect more precipitation which may prove to be disastrous for North America by flooding rivers and lakes. A rise in the sea levels is anticipated because of an increase in thermal expansion and the melting of ice caps and ice fields. The model suggested the combination of CO2 and volcanic emissions was responsible for most of the observed changes in temperature during the 1980's. Governments that control building and other development along coasts must begin to plan for rising sea levels. CFC's and other halo-carbons are found in refrigerants, solvents, and fire retardants. In the last decades the problems of atmospheric change have been gravelyadvanced by pollution resulting from human activities. the changes are small, so far, but they are expected to grow and speed up. So a change of a few degrees can have a dramatic effects. Within the next 50 to 100 years, the earth will continue to heat up hotter than it has been in the past million years.
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Acceptance Essays
