Sustainable & Smart Cities – Dassault Systèmes. By 2050, the World Health Organization predicts that 70% of the population, or 6.4 billion people, will be urbanites. Many will live in cities that are decades or centuries old, built for vastly smaller populations with very different needs. As these new metropolises gestate and grow, they risk becoming sprawling, inefficient sinks, wasting precious resources such as land, water and energy, and becoming harder to manage logistically. How can we build more efficient cities that not only consider its citizens, but also its impact on the entire planet and its resources?