Nowadays,greenhouse is very famous useful technology..Greenhouse or commonly call as glasshouse is a building where plants are cultivated.A greenhouse is a structure with a glass or plastic roof and frequently glass or plastic walls,it heats up because incoming solar radiation from the sun warms plants, soil, and other things inside the building. Air warmed by the heat from hot interior surfaces is retained in the building by the roof and wall. These structures range in size from small sheds to very large buildings.Greenhouse generally can be divided to plastic greenhouse and glass greenhouse.The glass used for a greenhouse works as a selective transmission medium for different spectral frequencies, and its effect is to trap energy within the greenhouse, which heats both the plants and the ground inside it.
For more information,you can go to http://en.wikipedia.org/wiki/Green_house
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