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The Green House Effect, Ozone Depletion, And Soil Salinity And Degradeation.

1367 words - 5 pages

The "GREENHOUSE EFFECT"Greenhouse effect is a warming of the lower atmosphere and surface of the planet by a complex process involving sunlight, gases, and particles in the atmosphere. The amount of heat-trapping atmospheric gases, called greenhouse gases, have greatly increased since the mid-1800's, when modern industry became widespread. Since the late 1800's, the temperature of the earth's surface has also risen. The greenhouse effect is so named because the atmosphere acts much like the glass roof and walls of a greenhouse, trapping in the heat from the sun.The natural greenhouse effect. The atmosphere reflects toward space about 30 percent of the energy in incoming sunlight. The atmosphere absorbs about another 30 percent and the remaining 40 percent or so reaches the earth's surface. The earth's surface reflects about 15 percent of the solar energy that reaches it, back toward space. The remaining energy heats the lands and seas. The warmed lands and seas then send most of the heat back into the atmosphere, mainly as infrared rays and in evaporated water. Infrared rays are much like light waves but are invisible to the human eye.When the rays from the lands and seas strike certain substances in the atmosphere, such as greenhouse gases and particles, those substances absorb the rays. As a result, the gases and particles are heated. They then are cooled by sending out infrared rays of their own. Some of the rays go into space. The remainder radiate back toward the earth's surface, adding to the warming of the surface layer of air. Without the natural greenhouse effect, the average temperature of the earth's surface would be about 33 degrees Celsius colder than it is now.The chief greenhouse gases are made up of atoms of carbon (C), hydrogen (H), and oxygen (O). These gases are water vapour, carbon dioxide, methane, and ozone. The greenhouse particles include cloud droplets, soot, and dust. Increases in greenhouse gases began in the mid-1800's, when the amount of carbon dioxide in the atmosphere increased by about 25 percent and the methane concentration had risen by about 150 percent. Most of the increase has been due to human activities--mainly the burning of fossil fuels (coal, oil, and natural gas) and the clearing of land.Fossil fuels contain carbon, and burning them creates carbon dioxide. Trees and other plants absorb the gas through the process of photosynthesis, but as land is cleared and forests are cut down, carbon dioxide levels rise.The average temperature of the earth's surface has increased about 0.5 to 1.5 Fahrenheit degrees (0.3 to 0.8 Celsius degrees) since the late 1800's. Scientists have not yet proven that an increase in atmospheric carbon dioxide has raised the surface temperature, but in the likely event that this relationship does exist, the eventual results could be severe. Many scientists estimate that by about 2050, the amount of carbon dioxide in the atmosphere will have doubled from the pre-industrial level. If...

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