What are green revolution?

The positive impacts of the Green Revolution are as follows: 1. The use of High Yield Variety seeds led to a substantial increase in the agricultural produce which helped our country in becoming self-sufficient in terms of availability of food grains. 2. The Green Revolution helped in increasing the economic conditions of all farmers (big as well as small) by ensuring improved production by the use of HYV seeds, fertilizers, pesticides and improved agricultural techniques. The negative impacts of the Green revolution are as follows:
1.The Green Revolution required a lot of water for irrigation purposes which shows unequal benefits derived  by farmers belonging to different regions of our country. 
2. The increased use of water resulted in lowering of ground water level in many regions.
3. The increased use of pesticides led to contamination of water and soil.