Inter Press Service: European nations from which millions once left to escape hardship and hunger - Greece, Ireland, Italy -- are today destinations for others doing the same.
Many people are on the move. The really big numbers relate to rural-urban migration in developing countries. In 1950, 746 million people lived in cities, 30 percent of the world's population. By 2014, urban population reached 3.9 billion (54 percent).
By comparison, about 4 million migrants have moved into OECD countries each year since 2007.(*)...