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A dog walks across an area of asphalt which covers what were protected mangroves once thrived near the Olympic golf site. <br />
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The authorities and private developers have poured billions of dollars into transportation projects, hotels, a residential complex to house the athletes and a vast Olympic Park where nearly half the sports will be played in Rio's expansive neighbourhood, Barra da Tijuca. <br />
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Those improvements join the private schools, gated communities, and other consumer culture that attracts middle-class families tired of run-down feel of Rio's older neighbourhoods. <br />
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However, the breakneck development has brought problems similar to those of which its new residents were fleeing, including congested traffic and untreated sewage in what was supposed to be a new model for urban living.