Grounds for concern over world's 'next tallest building'
Sky City falls short in safety features: critics
Urban planners have slammed proposals to build the world's tallest skyscraper in China, saying it would be a death trap in emergencies.
Sky City, if built, will be 220 stories tall and stand more than 838 meters, higher than the 828-meter-tall Burj Khalifa in Dubai, the world's tallest building.
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