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Thanks largely to vehicle emissions, Mexico City was once the world's most polluted urban centre. But over the past decade, a focus on sustainable alternative transport has persuaded a growing number of citizens to leave their cars at home. A heavily subsidised underground network caters for 22m journeys daily, and conditions on the city's overcrowded roads have improved, with the metro bus system and the introduction of public bicycles contributing significantly to reduced pollution levels

"The gardens are home to one of a growing number of azoteas verdes - or green roofs - that are springing up around Mexico City as part of the metropolis's efforts to purge its air of the pollution that has long been among its least-desired claims to fame."

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The rise of megacities - interactive By 2025, the developing world, as we understand it now, will be home to 29 megacities. We explore the latest UN estimates and forecasts on the growth of these 'cities on steroids', and take a look at the challenges and opportunities megacities present for the tens of millions living in Lagos, Mexico City and Dhaka

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brief outline of the outcome of the cancun meeting