The number of people who leave their countries to work abroad is soaring, according to the United Nations. More than 200 million people now live outside their country of origin, up from 150 million a decade ago.
And migration isn't just from poor countries to rich countries anymore. There also is significant migration from rich country to rich country — and even from poor country to poor.
Beginning Thursday, the U.N. will hold a high-level meeting on the subject in New York.