Brazil's celebrated coastal metropolis is defined by stark contrasts, both geographic and economic. Extravagant wealth rings the city's luxurious beaches, while poverty looks on from the haphazard developments called favelas that sprawl across the surrounding hills. Such conspicuous inequality is symbolic of the challenge humanity faces on a global scale - a problem that restricted progress at the Rio+20 meeting last week to a modest and mostly voluntary set of commitments.
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