According to a United Nations report, more than half of the world\'s population reside in cities - and, if current trends continue, that number will likely increase to 66 percent by 2050. For many urban areas, this growth will strain existing infrastructure, housing, transportation, and energy resources, potentially resulting in a wider inequality gap between the rich and poor. Malo A. Hutson, Ph.D., discusses the intersection of social justice and urban planning.\r\n