It elaborated further on SDG 11 to make cities and human settlements inclusive, safe, resilient and sustainable. Unplanned urbanization is causing cities to choke with congested traffic and air pollution, basic services like water and sanitation are not reaching citizens, particularly the poor, joblessness, crime, conflict and social strife are major problems, including in so-called developed countries, and natural disasters are becoming more destructive as people concentrate in dense areas. The relevance of cities in economic terms is absolutely remarkable, considering they occupy only between 3-4% of the world's available landmass.