As notified by the previous user, 700 million is the number of people worldwide who live outside their birth countries. What we have to comprehend here is emigration is due to multiple factors. Nevertheless, we could be able to gather all emigrating causes into different dimensions. For instance, you can understand some emigrant’s situation by taking a look at his economical background (mostly poverty), or considering his/her political context (civil wars are a notable antecedent of emigration).