GGP per capita

A guessing game which makes you think about how GGP (God Given Product per capita) is a nice natural metric to measure the potential of a country, especially for those that are traditionally considered poor. From photosynthesis 6*18 g of water and 6*44 g of CO2 are converted to 180 g of glucose, which is 720 kCal of energy. This means 1 g of water gives ~30  kJ. If all the rainfall water is used…