"If you could design a city that would be both a great place to live and good for the planet, what would it look like? Today, more than half the world's population lives in cities and many of those cities face big challenges, including the climate crisis, food insecurity and rapid population growth, but they are also places where innovation can thrive. Peek into the past to see how cities have changed through time and explore what could make them more sustainable and welcoming today and for tomorrow."-- Page 4 of cover.