According to UN data, cities currently generate 80% of world GDP while sheltering 50% of the population in just 3% of the planet's surface. Among them the 100 richest cities generate 35% of world GDP. However, poor planning and infrastructure can reduce business productivity by up to 40%.
Furthermore, the relationship between compactness and greenhouse gas generation is inversely proportional. For every 1% growth in the center rather than in the suburbs, 5 million of tonnes of CO2 per capita is saved, as well as an exponential increase in infrastructure, public services and transport costs involving expansive growth. (only in the United States that cost is estimated at 400 billion per year).
There is therefore a growing global consensus that urban planning strategies and policies must ensure that cities and human settlements are inclusive, secure, resilient, and sustainable. Consensus, which has materialized in objective 11 of Agenda 2030 for the sustainable development of the UN.
Within this global city aim, the CPTED (Protection of crime through the design of the environment) works to reduce the risk of crime and the sense of insecurity in addition to providing a substantial improvement in the resilience of cities to criminal events.
For this reason, the CPTED actions must respect, in addition to the CPTED Principles, a series of urban functioning premise that allows to obtain quality cities prepared to face a better future.