Nearly 150,000 Syrian refugees have already claimed asylum in Europe and tens of thousands more are flooding the borders in search of places to live. Meanwhile, in China, there are millions of new apartments sitting completely empty and entire sections of freshly constructed cities that are virtually uninhabited. This disparity between unmet housing need and oversupply has not been lost on many around the world, and after writing a book about China’s ghost cities, I’ve recently found my email inbox getting flooded with suggestions such as this: Do you think the Ghost Cities could be used, even as a temporary...