The 2012 Revision of the World Population Prospects is 23rd round of global demographic estimates and projections undertaken by the Population Division of the United Nations Department of Economic and Social Affairs of the United Nations Secretariat.
By the end of the 21st Century, the projections show widely divergent scenarios for the population of Asia. The high projection indicates there could be over 7.5 billion people or as few as 2.5 billion — currently there are about 4.1 billion people living in Asia. In turn, these projections hinge on the family size decisions made by billions of Asians throughout the next 80 years.
One thing should be obvious: an Asia with 7.5 billion people will be a place where wild creatures and ecosystems struggle terribly to survive and prosper. Already, the eastern Himalayas, Indo-Burma and the Western Ghats are under intense pressures from human population. On the other hand, if in 2100 Asia is home to a relatively small 2.1 billion people (two billion fewer than today), the right of other species to exist will be more likely to be realized.
(Source: United Nations)