why is the purpose of greenhouse

greenhouse is of two types ,one is natural in which the warming of the earth takes place .The another one is the man made green house . The use of the man made greenhouse are the following :-

1) It protects crops from too much heat or cold.

2) It shield plants from dust storm and blizzards.

3) It helps to keep out pests.

4) It allow the farmers to produce better quality crops with fewer inputs such as water and chemicals.

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