Lianyungang, a booming port city, has China's most extreme gender ratio for children under four: 163 boys for every 100 girls. These numbers don't seem terribly grim, but in ten years, the skewed sex ratio will pose a colossal challenge. By the time those children reach adulthood, their...

"As the most populous country in the world, China's demographic challenges have always been too many people for ecological system, resources, and the environment. However, by the early 1990s, fertility rate in China had dropped below the replacement level, and China's low fertility has now...