Sunday, October 30, 2011

World Population Clock That Boasts To Be Most Accurate...How Accurate Is It Really?

World Population Clock
Sure, this clock boasts to be the most accurate.  However, this clock only moves if you mouseover the numbers.  Therefore, how accurate could it be?  Check for on the link above or at the bottom of this post.

Countdown to 7 billion - why Worldometers clocks are the most accurate

The above world population clock and countdown counter are based on the estimates of the United Nations and will show the same number wherever you are in the world and whatever time you set on your PC.

Worldometers is the only website to present counters that are based on UN data and that do not follow the user's PC clock. Visitors around the world visiting a PC clock based counter, such as the the United Nations' one on will see different numbers depending on where they are located, and will see the clock reaching 7 billion when each of their locally set PC cloks hits 4:21:10 AM on October 31, 2011. There are 39 timezones around the world.
Obviously the UN data is based on estimates and can't be 100% accurate, so in all honesty nobody can possibly say with any degree of certainty on which day world population will really hit 7 billion, let alone at what time. But once an estimate is done (based on the best data and analysis available), the world population clock should be showing the same number at any given time anywhere around the world.

World Population 7 billion (2011)

The United Nations released the "2010 Revision of the World Population Prospects" (May 3, 2011) in which they raised their previous global demographic projections and now estimate that world population will reach 7 Billion on October 31, 2011.
The US Census Bureau has a lower estimate, for which the 7 billion mark will only be reached in February 2012.

World Population 6 billion (1999)

World population had reached 6 billion in 1999.
According to the United Nations the 6 billions figure was reached on October 12, 1999 (celebrated as the Day of 6 Billion) . According to the U.S. Census Bureau instead, it was reached on July 22, 1999, at about 3:49 AM GMT. Yet, according to the U.S. Census web site, the date and time of when 6 billion was reached will probably change because the already uncertain estimates are constantly being updated.

What was the population of the world in the past?

The chart above clearly illustrates how world population has changed in history. The US Census Bureau has assembled a table with estimated population from 10000 BC to 1950 according to different sources.
At the dawn of agriculture, about 8000 B.C., the population of the world was approximately 5 million. Over the 8,000-year period up to 1 A.D. it grew to 200 million (some estimate 300 million or even 600, suggesting how imprecise population estimates of early historical periods can be), with a growth rate of under 0.05% per year.
A tremendous change occurred with the industrial revolution: whereas it had taken all of human history until around 1800 for world population to reach one billion, the second billion was achieved in only 130 years (1930), the third billion in less than 30 years (1959), the fourth billion in 15 years (1974), and the fifth billion in only 13 years (1987). During the 20th century alone, the population in the world has grown from 1.65 billion to 6 billion.

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