UN summit tackles life quality in megacities

The UN estimates that by the middle of the century, more than seventy 70 percent of humans will be living in cities.
But this brings with it issues of alienation, pollution and overcrowding.
For the next three days a UN summit, in Ecuador's capital Quito, delegates will be discussing ways to improve life in the megacities of the future.
Al Jazeera's Daniel Schweimler looks at the challenges faced in two of South America's biggest cities - Santiago and Buenos Aires.
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