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Cities are growing more quickly than ever. As centers of economic, political and social life, urban areas are responsible for the vast majority of the world's energy use and greenhouse gas (GHG) emissions; they are the main contributors to air, noise, water and land pollution; they generate large quantities of waste; they are voracious consumers of natural resources; and they are particularly vulnerable to natural disasters and climate change. Given the current rates of urbanization, the environmental impacts of cities are giving rise to urgent concerns. How can city managers develop and...

Mobility is a key dimension of cities. As urbanization accelerates, the demand for mobility and transportation escalates. This booming demand stresses the existing urban transportation systems and infrastructures, intensifies widespread congestion and traffic gridlock, increases road accidents, and augments CO2 emissions and air and noise pollution, which is starting to cause serious health concerns. How will our current transport systems cope with this rising demand for mobility in cities? How can city planners and mayors around the world come up with strategies and solutions that enhance...