Population Change

There was very slow motion in population growth before 1650 AD in the history of population change. There was estimated about 250 million total population in the world in 1 AD. It took 1650 years to reach 500 million populations in the world. World population reached 1 billion in 1820. In 1930 and in 1975 the world population reached 3 & 4 billion. Population growth rate has seen rapid way so world population can be seen 5 billion in 1987. There are more than 7 billion populations in present world.
Population growth was unexpectedly growing from mid 17^th century in the world. Before 1750 Europe, Russ, and America and 1700 in China population growth took rapid way. According to population’s expert Kolean Clark, there was 3.5 billion population reached before date in the world that was estimated for 1900. Next expert Notestien estimated the world population 3.3 billion for 2000 but it reached before estimation date. In that way, according to fundamental broadcast statistic and united nation population depart estimated 6 billion populations but that reached 6 billion before estimated date in 1999.

There was rapid population growth in Europe among other world. Many people were migrated in Europe from difference region of world. From there, many populations moving process was increased towards America so that America became a new world. People migrating process towards America, Australia, Canada and other developed countries from developing countries are still in process. All proficient manpower moving towards developed countries is still running.

                    World population in 1830 to 2014

Period (AD)	Population size (billion)
1830 1930 1960 1975 1987 1999 2005 2009 2010 2014	1 2 3 4 5 6 6.5 6.8 6.9 7

             Sources, world population data sheet