Population of World
Early in 19th century after the industrial revolution the world experienced the increase in population rapidly. There were so many factors behind that growth including agricultural productivity, advancement in medical science increase in average age rate etc. It is also fact that growth rate is more increasing in less developed countries like Nigeria, Mali, Somalia etc. More than one third of the total world population lives in china and India, hence China the densely populated country of the world. Migration is also a factor. Immigration to developed countries has been on the rise since 1980s. Canada, USA are the hot centers of immigrants. Small and wealthy countries like UAE Singapore, Qatar are countries where people have attraction for job seekers. Beside these large numbers of refuges are faced to get shelter from war-torn regions.