The United Nations estimates that two-thirds of the people in the world will live in cities by 2050. This concentration focuses on the challenges and opportunities created by the unprecedented concentration of the world’s population in urban areas. The courses in this concentration explore the history of cities; urban challenges, such as affordable housing, public health, climate change, transportation, and poverty; and new opportunities for designing sustainable and equitable cities in the twenty-first century. Students with demonstrated knowledge in urbanism may pursue careers in urban planning, real estate development, international non-governmental organizations, community and economic development, transportation policy, sustainable urbanism, affordable housing advocacy and development, urban policy analysis, and in government.