Urban boom threatens Lake Titicaca with pollution

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The tranquil waters of Lake Titicaca on the border between Bolivia and Peru were believed to be the birthplace of the human race by the ancient Incans.

But as the population around the lake has expanded over the last 20 years, so has the amount of human and industrial waste - and there are growing calls for the tide of pollution to be stemmed.

Laura Plitt reports.

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