SMART SOLUTIONS FOR SUSTAINABLE CITIES
The 19th century was a century of empires. The 20th century was a century of states. The 21st
century will be a century of cities.” This quote by Wellington E. Webb, former mayor of the City
of Denver, seems plausible when you look at the numbers: Although cities cover only a fraction
of the Earth’s surface, they are already home to more than half of the world’s population.
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