Cities: the facts: the way they could be --.

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Cities: the facts: the way they could be --.

THE WAY CITIES ARE...

AIR QUALITY

A fifth of the world's population live in cities where the air is not fit to breathe. Burning coal and oil is the main cause. This produces emissions of carbon that contribute to global warming, sulphur dioxide that causes smog, and nitrogen oxide that creates a ...

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