Singapore rose to be one of the world’s most advanced cities by using its position as a trading hub to attract technology and investment. Now, caught in the squalls of a shift in global trade and technological change, the nation is pouring money into ideas that could define the way cities are built and run in future, making it a test bed for urban innovation.The island has few natural resources, hardly any land and faces many of the challenges that beset bigger developed nations such as Germany…