Book excerpt: As towns and cities expand at unprecedented rates, sustainable urban development is one of the most pressing challenges facing the international community in the 21st century. This publication examines the realities faced by urban populations around the world, focusing on the impact of globalisation and the way cities are governed and planned, on the make-up and density of their population, and on their cultures and economies. Issues considered include: the impact of globalisation on urban culture; urban renewal and cultural strategies; the concept of metropolitanization; socio-economic and cultural impacts of international migration; urban poverty and homelessness, social inequality and exclusion; urban governance, safety and crime trends; contemporary planning strategies and the role of civil society; progress towards attainment of the Millennium Development Goals targets for sanitation and housing. The report highlights the need for a new culture of planning to establish multicultural and inclusive cities, involving civil society as well as public authorities.