Green revolution is defined as an increase in crop production because of the use of new varieties of seeds, the use of pesticides and new agricultural techniques.
(noun)When a developing country first gets the use of chemical pesticides to kill bugs and fertilizers to encourage growth of crops, and the crop growth dramatically increases in that country, this is known as a green revolution.
See green revolution in Webster's New World College Dictionary
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See green revolution in American Heritage Dictionary 4
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