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Approximately 5 billion of the world's residents — more than 60% — will...

Yale University: Approximately 5 billion of the world's residents — more than 60% — will live in urbanized... Published Jan 1, 2012. Status: Pending. Track the...

Approximately 5 billion of the world's residents — more than 60% — will live in urbanized areas by 2030.

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Original source: pnas.org