According to the United Nations, World Population to Grow to 9 billion by 2050

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As the world population surges, what will the impact be on cities?

... the number of those living in urban areas will swell by 3 billion to hit 6.3 billion. With demand from cities for energy and resources is set to spike on the back of urban population growth, smart cities have emerged as the modern answer to the wave of urbanization sweeping across the globe.

What's a smart city?  Find the answers here.

Key quote in article:

Professor Gerhard Schmitt, executive director at the Singapore-ETH Centre for Global Environmental Sustainability, notes that “there is a strong link between smartness, sustainability and liveability”.