Green Eye and Doppio are produced all around the globe. And they change according to region in where they are cultivated. So, the question arises what is Green Eye and Doppio's differentiating factor?In following section we will take a close look at what is Green Eye and Doppio color, serving style, types and much more. First thing to know is what are the different types of Green Eye and Doppio. Well, Green Eye types include Espresso while types of Doppio are Espresso.