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In environmental science the green house effect is a common term for the role water vapor carbon dioxide and ozone play in keeping the earths surface warmer than it would normally be The atmosphere is primarily transparent to infrared radiation from the sun which is mostly absorbed by the earths surface The earth being much cooler than the sun remits radiation most strongly at infrared wavelengths Water vapor carbon dioxide and ozone then absorb much of this radiation and remit a large proportion back towards the earth The atmosphere thus acts as a kind of blanket without its presents the earths average ground temperature of 15 degrees Celsius would fall to -28 degrees Celsius The termed greenhouse effect implies that a comparable effect keeps the interior of the green house warm Actually the man role of the glass in a green house is to prevent convection currents from mixing cooler air outside with the warmer air inside Although water is the most important factor in the greenhouse effect is a major reason why human regions experience less cooling at night than do dry regions Changes in both water and carbon dioxide play an important role in climate changes For this reason many scientist have expressed concerns over the global increase of carbon dioxide in resent decades largely as a result of the burring of fossil fuels In many other factors of the earths present climate remain more or less constant the carbon dioxide increase should raise the average temperature at the earths surface Because warm air can contain warm water before reaching saturation than cooler air can the amount of water would probably increase as the atmosphere got warmer This process could go on forever Although this considered unlikely many negative feed backs could as so occur such as increase in cloud cover or increase carbon dioxide absorption by the oceans the results of even a limited rise in average surface
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