Based on observation and analyses, the Graduate School and Faculty of Urban Environmental Sciences clarifies the interactions among 1) the natural environment, 2) humans, 3) materials, 4) energy, 5) information, and 6) man-made structures such as buildings and automobiles, as crucial elements that construct urban environments. The Graduate School and Faculty aims to develop methodologies for predicting, designing, and controlling the interactions and concentration of each element in any space and at any time, and to establish a system of urban environmental sciences that leads to a construction of a sustainable society. The Graduate School and Faculty promotes advanced research on each element as a priority area, not only to solve, but also to discover problems in realizing a sustainable "Mega-City."