GR = Green Revolution
An example would be: Africa south of the sahara
Advantages: Increase in yields
Healthier Plants/ veg
Increased Well-being for the people
People become richer through selling excess crops
Disadvantages: Loss of jobs, due to machinery
Potential poisoning of the land, through artificial fertiliser
The earths natural minerals do not replenish as fast due to more harvests per annum
That would be my basic answer, but as with everything to do with geograpy you'd need to expand heavily on these!
Hope that helped..