RIO DE JANEIRO: In fast-growing cities across the developing world more than 70 per cent of residents lack access to basic services like clean water, affordable transportation or decent housing, a research group said on Friday ahead of a UN conference on urbanization. By 2050, 2.5 billion people will move into the world’s cities, said the World Resources Institute. By 2050, 2.5 billion people, a bigger population than China and India combined,...