Today, October 31, is World Cities Day. On the occasion of this celebration, the importance of one of the 17 United Nations Sustainable Development Goals, the one that gives voice to sustainable cities and communities, is recalled.


The aim of this chapter is to achieve that cities and human settlements are inclusive, safe while resilient and sustainable.

More than half of humanity, in other words, 3.5 billion people, currently live in cities and this figure is only growing exponentially. By 2050 this figure is expected to increase to 6.5 billion, hence two-thirds of humanity. Cities provide a number of opportunities, well-being and prosperity in people's lives but still generate social, environmental and economic inequalities.

Large cities occupy only 3% of the land but represent between 60 to 80 % of energy consumption and at least 70% of carbon emissions. An estimated 828 million people live in slums. In the event that everything continues along the same lines and cities experience this organic growth, slums, greenhouse gas emissions, large suburbs, traffic intensity, among others will be boosted.

Achieving the SDGs of the 2030 Agenda involves radically transforming the way in which urban spaces are built and managed, in order to achieve sustainable development. Now more than ever, access to safe and affordable housing, investing in public transport, creating more green public areas, improving marginal settlements, achieving sustainable management and the efficient use of natural resources must be guaranteed.

It is essential to create resilience mechanisms in rural areas to prevent the collapse of cities, to transform rural ecosystems into sustainable smart territories, and to contribute to the sustainability of smart cities.