Current World Population and Habitation Density
How Much Space Is There Left For Us To Live On
Stes
de Necker
The world population (the total number of living humans on Earth)
was 7.244 billion as of July 2014 according to the medium fertility estimate by
the United Nations Department of Economic and Social Affairs, Population
Division and it is projected to reach 7.325 billion in July 2015. According to
the U.S. Census Bureau, world population reached 7 billion on March 12, 2012.
The UN data is based on estimates and can never be 100% accurate,
so in all honesty nobody can possibly say with any degree of certainty on which
day world population reaches 7 billion (or any other exact number), let alone
at what time. The United Nations Population Division of
the Department of Economic and Social Affairs every two years calculates,
updates, and publishes estimates of total population in its World
Population Prospects series. These population estimates and projections
provide the standard and consistent set of population figures that are used
throughout the United Nations system.
For most countries adjustment of the data is necessary to correct errors,
omissions, and inconsistencies in the data. Since the most recent data
for a single country is often at least two years old,
the current world population figure is necessarily a projection of past data
based on assumed trends.
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. In 1970, there were roughly half as many
people in the world as there are now.
World population milestones
8 Billion (2024)
According to the most recent United Nations estimates, the human
population of the world is expected to reach 8 billion people in the
spring of 2024.
7 Billion (2011)
According to the United Nations, world population reached 7
Billion on October 31, 2011.
The US Census Bureau made a lower estimate, for which the 7 billion mark was
only reached on March 12, 2012.
6 Billion (1999)
According to the United Nations, the 6 billion figure was
reached on October 12, 1999 (celebrated as the Day
of 6 Billion). According to the U.S. Census Bureau instead, the six
billion milestone 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.
5 Billion: 1987
4 Billion: 1974
3 Billion: 1960
2 Billion: 1927
1 Billion: 1804
The population of the world is currently growing at a rate of
around 1.14% per year. The average population change is currently
estimated at around 80 million per year.
Annual growth rate reached its peak in the late 1960's, when it was
at 2% and above. The rate of increase has therefore almost halved since its
peak of 2.19 percent, which was reached in 1963.
The annual growth rate is currently declining and is projected to
continue to decline in the coming years. Currently, it is estimated that it
will become less than 1% by 2020 and less than 0.5% by 2050.
This means that world population will continue to grow in the 21st
century, but at a slower rate compared to the recent past. World population has
doubled (100% increase) in 40 years from 1959 (3 billion) to 1999 (6 billion).
It is now estimated that it will take a further 43 years to increase by another
50%, to become 9 billion by 2042.
The latest United Nations projections indicate that
world population will nearly stabilize at just above 10 billion persons after
2062.
By 2030 India's population is expected to surpass China's, to
become the largest country in the world.
Nigeria's population is expected to surpass the U.S. population in
2045 to become the third-most populous country in the world, starting to rival
China by the end of the century, with almost 1 billion people in 2100.
World Population Density (people/km² - 100 hectares)
Population density map of the world showing not only countries but
also many subdivisions (regions, states, provinces).
It appears from most
scientific sources that the total Land surface of our planet earth, is
approximately 149,000,000 km².
The land surface can be
divided into four different types:
1. 20% covered by snow,
2. 20% mountains,
3. 20% dry land,
3. 30% good land that can be farmed,
4. 10% land doesn't have topsoil.
This means
that only about 50% of the world’s land surface is suitable for human
habitation, ie. approximately 75,000,000 km².
With a
current total world population of 7.3 billion people, it means that for every
person on earth there is approximately 10,000 m² (1 hectare) land available.
Bibliographic Entry
|
Result
(w/surrounding text)
|
Standardized
Result
|
Coble, Charles R;
Murray, Elaine G; Rice, Dole R. Earth Science. Englewood Cliffs, NJ:
Prentice-Hall, 1987: 102.
|
"Surface Area:
Land area, about 148,300,000 sq km, or about 30% of total surface
area; water area, about 361,800,000 sq km, or about 70% of total
surface area."
|
148,300,000 km2
|
Science Desk
Reference American Scientific. New York: Wiley, 1999: 180.
|
"Surface: Land
surface 150,000,000 sq km, 57,500,000 sq mi."
|
150,000,000 km2
|
Weast, Robert
C. CRC Handbook of Chemistry and Physics 61st edtion. Chemical Rubber
Co., 1981: F-202.
|
"Data in regard
to the earth: Land area, 148.847x106 km2, 57.470x106 sq mi.
Ocean area, 361.254x106 km2, 139.480x106 sq mi."
|
148,847,000 km2
|
Weast, Robert
C. CRC Handbook of Chemistry and Physics 48th edtion. Chemical Rubber
Co., 1968: F-135.
|
"Data in regard
to the earth (continued): Land area, 148.847x106 km2,
57.470x106 sq mi. Ocean area, 361.254x106 km2,
139.480x106 sq mi."
|
148,847,000 km2
|
|
"surface area:
196,935,000 sq miles
percent of earths [sic] ocean 70% *
percent of earths [sic] land: 30"
|
153,295,000 km2
|
World Population by Religion
According to a recent study (based on the 2010 world population of
6.9 billion) by The Pew Forum, there are:
(1) 2,173,180,000 Christians (31% of world population), of
which 50% are Catholic, 37% Protestant, 12% Orthodox, and 1% other.
(2) 1,598,510,000 Muslims (23%), of which 87-90% are Sunnis, 10-13%
Shia.
(3) 1,126,500,000 No Religion affiliation (16%): atheists, agnostics
and people who do not identify with any particular religion. One-in-five people
(20%) in the United States are religiously unaffiliated.
(4) 1,033,080,000 Hindus (15%), the overwhelming majority (94%) of
which live in India.
487,540,000 Buddhists (7%), of which half live in China.
(5) 405,120,000 Folk Religionists (6%): faiths that are closely
associated with a particular group of people, ethnicity or tribe.
(6) 58,110,000 Other Religions (1%):
Baha’i faith, Taoism, Jainism, Shintoism, Sikhism, Tenrikyo, Wicca,
Zoroastrianism and many others.
(7) 13,850,000 Jews (0.2%), four-fifths of which live in two
countries: United States (41%) and Israel (41%).
Population by Worlds 10 largest Countries
Rank
|
Country
|
Population (2014)
|
Share of
World Pop
|
1 Year Change
|
Area (Km²)
|
Density
(P/Km²)
|
1
|
|
1,393,783,836
|
19.24%
|
0.59%
|
9,596,947
|
145
|
2
|
|
1,267,401,849
|
17.50%
|
1.22%
|
3,287,265
|
386
|
3
|
|
322,583,006
|
4.45%
|
0.79%
|
9,629,056
|
34
|
4
|
|
252,812,245
|
3.49%
|
1.18%
|
1,904,567
|
133
|
5
|
|
202,033,670
|
2.79%
|
0.83%
|
8,514,209
|
24
|
6
|
|
185,132,926
|
2.56%
|
1.64%
|
796,096
|
233
|
7
|
|
178,516,904
|
2.46%
|
2.82%
|
923,766
|
193
|
8
|
|
158,512,570
|
2.19%
|
1.22%
|
143,998
|
1,101
|
9
|
|
142,467,651
|
1.97%
|
-0.26%
|
17,076,310
|
8
|
10
|
|
126,999,808
|
1.75%
|
-0.11%
|
377,873
|
336
|
How many people have ever lived on earth?
It was written during the 1970's that 75% of the people who had ever
been born were alive at that moment. This was grossly false.
Assuming that we start counting from about 50,000 B.C., the time
when modern Homo sapiens appeared on the earth (and not from 700,000 B.C. when
the ancestors of Homo sapiens appeared, or several million years ago when
hominids were present), taking into account that all population data
are a rough estimate, and assuming a constant growth rate applied to each
period up to modern times, it has been estimated that
a total of approximately 106 billion people have been born since the
dawn of the human species, making the population currently alive roughly 6% of
all people who have ever lived on planet Earth.
Others have estimated the number of human beings who have ever
lived to be anywhere from 45 billion to 125 billion, with most estimates
falling into the range of 90 to 110 billion humans.