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If income remains significant, we either have not discovered the correct mechanism, or income may not be a simple indicator.

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We will need new technologies to generate energy and use it in clean and safe ways, only from fully ______ sources.

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New York has invested substantially in improving the ______ of its waterways in recent years.

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Copenhagen has been voted the most ______ city in the world several times.

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China has already been experimenting with ways to make its cities more ______ for the last two decades.

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The high-speed train link is responsible for one of the biggest urban regeneration projects in the area.

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By 2050, seven out of every 10 people on Earth will be a(n) ______ .

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Vancouver is often considered to be one of the most ______ cities in the world.