Population+density

High population densities produce a high concentration of waste. Waste that is not suitably treated is pollution. Sustainable cities must be able to manage their waste. This is the major factor in limiting city size. The costs of managing waste increase disproportionately with size

Advantages of high population densities:
1. More accessible services. 2. More efficient design and use of land and infrastructure as there is more sharing and less disuse. 3. Efficiencies in service provision (economies of scale). 4. More diverse services available (greater demand leads to greater supply)

[] Higher **population density** reduces travel distance, allowing more walking and cycling, and provides a larger customer base for [|public transport]. The article [|Green Manhattan][|[1]] makes a case for very large buildings and densely populated cities, such as [|Manhattan], being a far more sustainable form of settlement than low-density [|suburbia]. In theory, higher **housing density** can be cheaper, and allow for cheaper provision of services and [|public transport]. Higher density housing in the form of apartments and terrace housing also has the potential to have lower heating and cooling requirements.

Population distribution
A self-reliant

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