A study of the areas of Pedralbes, Sarria, and El Tibidabo: When thinking of a zero emission Barcelona, one must first study, analyze and quantify emission. The mapping exercise in this area helps us quantify electricity consumption per square meter in both buildings and plots based on their function or functions. Most importantly it analyzes the relationship between the three (building/plot/function) , which suggests areas of critical CO2 emission. It is important to study CO2 emissions based on size of building, plot and their functions. With these factors in mind, we can implement the right strategy of generating clean energy in the right building and, or area. The proposal search: The right strategy of reduction of energy consumption. The better use and maintaining of green areas, and the generation of clean energy based on the right method for the right place. emission-(reduction+clean energy) = zero