Uploaded on 2019-05-24 by Aurian Durbuis

1) Flow of people and density/stock of people: They are both link because most of the people entering or leaving the city are doing so because they are not living in the city but in the suburbs or in the further surroundings. So far, because of the car-culture in the US, the density has tended to decrease with the increase of the suburbs. Ideally, we should reverse this trend to reconcentrate the city and prevent urban sprawl. An increase in density in the city would allow for smaller energy intensity/capita within its border and allow more people to live in the city, thereby reducing the flow of people and congestion and pollution caused by it. 2) Flow of water/food. They are linked with the population so there are likely to increase as the population grows. However, by applying system that could increase efficient and promote savings and diminish consumption, we could try to reduce them. 3) Flow of energy. This encompasses fossil fuels, Electricity, etc. This is extremely important as it will determine heavily the emissions of the city. This consumtpion/emission can be reduced by deploying energy efficient technologies and standards as well as promoting saving behaviors.