摘要：In different countries of the world, the state administrators have identified the country by preparing the borders of their country. It is found that all the countries have done the work of keeping officials records of people coming and going from one country to another. People who travel to different countries of the world come mainly as tourism, business, labor, diplomatic, government work, family relation and refugees, etc. Under normal circumstances, about 15 to 18 percent of the world’s population travels to another country each year. In this article, we investigate the immigration causes, their effects on environment in the context of Nepal.
