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In environmental science the green house effect is a common term forthe role water vapor carbon dioxide and ozone play in keeping the earths surfacewarmer than it would normally be The atmosphere is primarily transparent to infraredradiation from the sun which is mostly absorbed by the earths surface The earthbeing much cooler than the sun remits radiation most strongly at infrared wavelengthsWater vapor carbon dioxide and ozone then absorb much of this radiation and remit a largeproportion back towards the earth The atmosphere thus acts as a kind of blanket withoutits presents the earths average ground temperature of 15 degrees Celsius would fallto -28 degrees Celsius The termed greenhouse effect implies that a comparable effectkeeps the interior of the green house warm Actually the man role of the glass in a greenhouse is to prevent convection currents from mixing cooler air outside with the warmer airinside Although water is the most important factor in the greenhouse effectis a major reason why human regions experience less cooling at night than do dry regionsChanges in both water and carbon dioxide play an important role in climate changes Forthis reason many scientist have expressed concerns over the global increase of carbondioxide in resent decades largely as a result of the burring of fossil fuels In manyother factors of the earths present climate remain more or less constant the carbondioxide increase should raise the average temperature at the earths surface Becausewarm air can contain warm water before reaching saturation than cooler air can the amountof water would probably increase as the atmosphere got warmer This process could go onforever Although this considered unlikely many negative feed backs could as so occursuch as increase in cloud cover or increase carbon dioxide absorption by the oceans theresults of even a limited rise in average surface temperature remains sufficientlydramatic to justify concern In October 1983 the US Environmental Protection Agency released areport that projected the irreversible onset of the
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