green house effect

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GREEN HOUSE EFFECT
INTRODUCTION
In temperate countries some economically important plants that cannot grow outside at a very low temperature during the winter are grown in glass-walled & glass-roofed growth chambers (known as glass houses)exposed to sunlight. Glass houses are also used in sub tropiacal regions during winter months & relatively cold high altitude for high value horticultural annual crops including flowers on a cmmercial scale as well as for research work especially for breeding of new varities & crop physiological & pathological studies. Temperature within the glass house rises because of the glass of the roof & walls through it allows entry of sunlight with little obstruction,resist the escaping of the reflected light of longer wave-lengths rich in infra-red rays resulting in a heat built up. Such glass houses are called green housesas the light & heat within such houses prove very effective for profuse growth of green plants.
The property of trapping heat by carbon di oxide & other gases of the atmosphere is similar to the glass cover of green house that reasists the escaping of heat radiated from inside of the house.As such, these atmospheric gases are called green house gases that resist the escaping of radiated heat from the earth by absorbing infra red rays & particularly reflecting the trapped heat back to earth's surface.this phenomenon is therefore called the green-house effect in wicch certain atmospheric gases act in a manner similar to the glass cover of glass house,as earth itself act as a green-house.
MAJOR GREEN HOUSE GASES
The major sources of green house gases are (i)CARBON DI OXIDE - It comes from burning of fossil fuels &from deforrestation. (ii)METHANE- It comes from paddy field,burning of wood,wetland etc. (iii)CHLOROFLURO CARBONS -which is populary known as CFC. It comes from air conditioning industry,foam packaging industries. (iv)NITROUS OXIDE-It comes from coal burning,motor veicheles,breakdown of chemial fertilizer,biomass burning.
Carbon-di-oxide is the major green-house gas responsible for more than 55% of the green-house-effect. Methane is responsible for 20%,CFC is responsible for 15% & NO is responsible for 5% of the green-house effect.
If the amount of carbon-di-oxide & other green-house gases would increase in the atmsphere ,the temperature on the surface of the earth & that of the layers of air adjuscent to the surface would increase,on the other hand global temperature would increase with the decrase in amount of the green house gases in the atmosphere.In fact the amount of all the green-house gase in the atmosphere is gradually increasing, as a result of which it is predicted that the global temperature would increase & there would be climatic changes on the earth resulting in adverse effects on the ecosystem of earth.

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