This document discusses perspectives on smart cities from New York, Ahmedabad, São Paulo, and Beijing. It begins with an overview of the concept of smart cities and how new technologies are being applied by companies and governments to address challenges facing rapidly growing urban areas. The essays examine how smart technologies could help New York prepare for hurricanes like Sandy, ease social tensions in Brazilian cities, and make urban agriculture viable in China. One essay argues that smart cities should facilitate more public participation and transparency in decision making to balance top-down and bottom-up approaches to urban planning and help cities adapt to changing times. It provides examples of how technologies could help speed up and improve New York's land use approval process.