April 5, 2014
http://www.realclearworld.com/articles/2014/04/05/world_population_trends_signal_danger_ahead_110414.html
By Barry Mirkin
The United Nations has released population data confirming the continuation of long-term global demographic trends and a larger global population than previously projected. Nations cannot afford to ignore trends including reduced fertility among most nations and limited family planning for others, and growing ranks of the elderly and accelerated urbanization pose new challenges.
The world population is larger. Global population achieved a milestone in 2011, hitting the 7 billion mark. Currently at 7.2 billion, the world is projected to increase by almost another billion people, climbing to 8.1 billion by 2025.
The population is older. Countries continue to age substantially, with those aged 60 or older the fastest growing segment. In developed countries, almost one in four is an older person, with more older people than children. Fertility is lower and family size smaller. The decline in population growth at the world level is the consequence of near universal reduction of fertility. Women are marrying later or not at all, postponing childbearing and having fewer or no children, and fertility has fallen to 2.5 children per woman. People are also living longer. Life expectancy is higher in most countries due to systematic progress against mortality. One can expect to live to age 77 in developed countries and to age 67 in developing countries.
The world is more urbanized. More than half of the world's population consists of urban dwellers, and this is expected to climb to two-thirds by mid-century. International migration is increasing in both volume and impact. Although the increase in the number of migrants has faltered in the aftermath of the global economic recession, more people than ever reside in a country other than where they were born. There are 232 million international migrants, 3 percent of world population.