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 World population

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 World population estimates from 1800 to 2100 , based on `` high '' , `` medium '' and `` low '' United Nations projections in 2015 and UN historical estimates for pre-1950 data Population growth graph generated with data supplied by World Bank , via Google World population percentage by country

 In demographics , the world population is the total number of humans currently living , and was estimated to have reached 7.6 billion as of March 2018 .

 World population has experienced continuous growth since the end of the Great Famine of 1315 -- 17 and the Black Death in 1350 , when it was near 370 million . The highest population growth rates -- global population increases above 1.8 % per year -- occurred between 1955 and 1975 , peaking to 2.06 % between 1965 and 1970 . The growth rate has declined to 1.18 % between 2010 and 2015 and is projected to decline further in the course of the 21st century .

 Total annual births were highest in the late 1980s at about 139 million , and as of 2011 were expected to remain essentially constant at a level of 135 million , while deaths numbered 56 million per year and were expected to increase to 80 million per year by 2040 . The median age of the world 's population was estimated to be 30.1 years in 2016 .

 World population ( millions , UN estimates )

 #

 Top ten most populous countries

 2000

 2015

 2030 *

 China *

 1,270

 1,376

 1,416

 India

 1,053

 1,311

 1,528

 United States

 283

 322

 356

 Indonesia

 212

 258

 295

 5

 Brazil

 176

 208

 229

 6

 Pakistan

 138

 189

 245

 7

 Nigeria

 123

 182

 263

 8

 Bangladesh

 131

 161

 186

 9

 Russia

 146

 146

 149

 10

 Mexico

 103

 127

 148

 World total

 6,127

 7,349

 8,501

 Notes :

 China = excludes Hong Kong and Macau

 2030 = Medium variant

 Contents

 ( hide )

 1 Population by region

 1.1 Population by continent

 2 History

 2.1 Antiquity and Middle Ages

 2.2 Modern era

 2.3 Milestones by the billions

 3 Global demographics

 4 Largest populations by country

 4.1 Most densely populated countries

 5 Fluctuation

 5.1 Population growth by region

 5.2 Past population

 5.3 Projections

 6 Mathematical approximations

 6.1 Years for world population to double

 7 Overpopulation

 7.1 Predictions of scarcity

 7.2 Environmental impacts

 7.3 Population control

 7.4 Overpopulation skepticism

 8 See also

 9 Notes

 10 References

 11 External links

 Population by region ( edit )

 Six of the Earth 's seven continents are permanently inhabited on a large scale . Asia is the most populous continent , with its 4.3 billion inhabitants accounting for 60 % of the world population . The world 's two most populated countries , China and India , together constitute about 37 % of the world 's population . Africa is the second most populated continent , with around 1 billion people , or 15 % of the world 's population . Europe 's 733 million people make up 12 % of the world 's population as of 2012 , while the Latin American and Caribbean regions are home to around 600 million ( 9 % ) . Northern America , primarily consisting of the United States and Canada , has a population of around 352 million ( 5 % ) , and Oceania , the least - populated region , has about 35 million inhabitants ( 0.5 % ) . Though it is not permanently inhabited by any fixed population , Antarctica has a small , fluctuating international population based mainly in polar science stations . This population tends to rise in the summer months and decrease significantly in winter , as visiting researchers return to their home countries .

 Population by continent ( edit )

 Population by continent ( 2016 estimates )

 Continent

 Density ( inhabitants / km )

 Population ( millions )

 Most populous country

 Most populous city ( metropolitan area )

 Asia

 96.4

 4,436

 1,382,300,000 - China

 35,676,000 / 13,634,685 - Greater Tokyo Area / Tokyo Metropolis

 Africa

 36.7

 1,216

 0186,987,000 - Nigeria

 21,000,000 - Lagos

 Europe

 72.9

 738

 0145,939,000 - Russia ; approx. 112 million in Europe )

 19,468,664 - Moscow

 North America

 22.9

 579

 0324,991,600 - United States

 23,723,696 / 08,537,673 - New York Metropolitan Area / New York City

 South America

 22.8

 422

 0209,567,000 - Brazil

 27,640,577 / 11,316,149 - Metro Area / São Paulo City

 Oceania

 4.5

 39.9

 0024,458,800 - Australia

 05,005,400 - Sydney

 Antarctica

 0.0003 ( varies )

 0.004 in summer ( non-permanent , varies )

 N / A

 0000001,200 ( non-permanent , varies ) - McMurdo Station

 History ( edit )

 See also : World population estimates and History of the world

 Estimates of world population by their nature are an aspect of modernity , possible only since the Age of Discovery . Early estimates for the population of the world date to the 17th century : William Petty in 1682 estimated world population at 320 million ( modern estimates ranging close to twice this number ) ; by the late 18th century , estimates ranged close to one billion ( consistent with modern estimates ) . More refined estimates , broken down by continents , were published in the first half of the 19th century , at 600 to 1000 million in the early 1800s and at 800 to 1000 million in the 1840s .

 Antiquity and Middle ages ( edit )

 Main articles : Classical demography and Medieval demography

 Estimates of the population of the world at the time agriculture emerged in around 10,000 BC have ranged between 1 million and 15 million . Even earlier , genetic evidence suggests humans may have gone through a population bottleneck of between 1,000 and 10,000 people about 70,000 BC , according to the Toba catastrophe theory . By contrast , it is estimated that around 50 -- 60 million people lived in the combined eastern and western Roman Empire in the 4th century AD .

 The Plague of Justinian , which first emerged during the reign of the Roman emperor Justinian , caused Europe 's population to drop by around 50 % between the 6th and 8th centuries AD . The population of Europe was more than 70 million in 1340 . The Black Death pandemic of the 14th century may have reduced the world 's population from an estimated 450 million in 1340 to between 350 and 375 million in 1400 ; it took 200 years for population figures to recover . The population of China decreased from 123 million in 1200 to 65 million in 1393 , presumably due to a combination of Mongol invasions , famine , and plague .

 Starting in AD 2 , the Han Dynasty of ancient China kept consistent family registers in order to properly assess the poll taxes and labor service duties of each household . In that year , the population of Western Han was recorded as 57,671,400 individuals in 12,366,470 households , decreasing to 47,566,772 individuals in 9,348,227 households by AD 146 , towards the End of the Han Dynasty . At the founding of the Ming Dynasty in 1368 , China 's population was reported to be close to 60 million ; toward the end of the dynasty in 1644 , it may have approached 150 million . England 's population reached an estimated 5.6 million in 1650 , up from an estimated 2.6 million in 1500 . New crops that were brought to Asia and Europe from the Americas by Portuguese and Spanish colonists in the 16th century are believed to have contributed to population growth . Since their introduction to Africa by Portuguese traders in the 16th century , maize and cassava have similarly replaced traditional African crops as the most important staple food crops grown on the continent .

 The pre-Columbian North American population probably numbered somewhere between 2 million and 18 million . Encounters between European explorers and populations in the rest of the world often introduced local epidemics of extraordinary virulence . According to the most extreme scholarly claims , as many as 90 % of the Native American population of the New World died due to Old World diseases such as smallpox , measles and influenza . Over the centuries , the Europeans had developed high degrees of immunity to these diseases , while the indigenous peoples had no such immunity .

 Modern era ( edit )

 Map showing urban areas with at least one million inhabitants in 2006 . Only 3 % of the world 's population lived in urban areas in 1800 ; this proportion had risen to 47 % by 2000 , and reached 50.5 % by 2010 . By 2050 , the proportion may reach 70 % .

 During the European Agricultural and Industrial Revolutions , the life expectancy of children increased dramatically . The percentage of the children born in London who died before the age of five decreased from 74.5 % in 1730 -- 1749 to 31.8 % in 1810 -- 1829 . Between 1700 and 1900 , Europe 's population increased from about 100 million to over 400 million . Altogether , the areas populated by people of European descent comprised 36 % of the world 's population in 1900 .

 Population growth in the West became more rapid after the introduction of vaccination and other improvements in medicine and sanitation . Improved material conditions led to the population of Britain increasing from 10 million to 40 million in the 19th century . The population of the United Kingdom reached 60 million in 2006 . The United States saw its population grow from around 5.3 million in 1800 to 106 million in 1920 , exceeding 307 million in 2010 .

 The first half of the 20th century in Imperial Russia and the Soviet Union was marked by a succession of major wars , famines and other disasters which caused large - scale population losses ( approximately 60 million excess deaths ) . After the collapse of the Soviet Union , Russia 's population declined significantly -- from 150 million in 1991 to 143 million in 2012 -- but by 2013 this decline appeared to have halted .

 Many countries in the developing world have experienced extremely rapid population growth since the early 20th century , due to economic development and improvements in public health . China 's population rose from approximately 430 million in 1850 to 580 million in 1953 , and now stands at over 1.3 billion . The population of the Indian subcontinent , which was about 125 million in 1750 , increased to 389 million in 1941 ; today , India , Pakistan and Bangladesh are collectively home to about 1.63 billion people . Java had about 5 million inhabitants in 1815 ; its present - day successor , Indonesia , now has a population of over 140 million . In just one hundred years , the population of Brazil decupled ( x10 ) , from about 17 million in 1900 , or about 1 % of the world population in that year , to about 176 million in 2000 , or almost 3 % of the global population in the very early 21st century . Mexico 's population grew from 13.6 million in 1900 to about 112 million in 2010 . Between the 1920s and 2000s , Kenya 's population grew from 2.9 million to 37 million .

 Milestones by the billions ( edit )

 Main article : World population milestones

 World population milestones in billions

 Population

 5

 6

 7

 8

 9

 Year

 1804

 1927

 1960

 1999

 2011

 2024

 2042

 Years elapsed

 -- --

 123

 33

 14

 13

 12

 12

 13

 18

 It is estimated that the world population reached one billion for the first time in 1804 . It was another 123 years before it reached two billion in 1927 , but it took only 33 years to reach three billion in 1960 . Thereafter , the global population reached four billion in 1974 , five billion in 1987 , six billion in 1999 and , according to the United States Census Bureau , seven billion in March 2012 . The United Nations , however , estimated that the world population reached seven billion in October 2011 .

 According to current projections , the global population will reach eight billion by 2024 , and will likely reach around nine billion by 2042 . Alternative scenarios for 2050 range from a low of 7.4 billion to a high of more than 10.6 billion . Projected figures vary depending on underlying statistical assumptions and the variables used in projection calculations , especially the fertility variable . Long - range predictions to 2150 range from a population decline to 3.2 billion in the `` low scenario '' , to `` high scenarios '' of 24.8 billion . One extreme scenario predicted a massive increase to 256 billion by 2150 , assuming the global fertility rate remained at its 1995 level of 3.04 children per woman ; however , by 2010 the global fertility rate had declined to 2.52 .

 There is no estimation for the exact day or month the world 's population surpassed one or two billion . The points at which it reached three and four billion were not officially noted , but the International Database of the United States Census Bureau placed them in July 1959 and April 1974 respectively . The United Nations did determine , and commemorate , the `` Day of 5 Billion '' on July 11 , 1987 , and the `` Day of 6 Billion '' on October 12 , 1999 . The Population Division of the United Nations declared the `` Day of 7 Billion '' to be October 31 , 2011 .

 Global Demographics ( edit )

 Main article : Demographics of the world 2012 map showing average life expectancy by country in years . In 2012 , the World Health Organization estimated the average global life expectancy as 70.5 years .

 80 + 77.5 + 75 + 72.5 + 70 + 67.5 + 65 +

 60 + 55 + 50 + 45 + 40 + less than 40

 As of 2012 , the global sex ratio is approximately 1.01 males to 1 female . The greater number of men is possibly due to the significant sex imbalances evident in the Indian and Chinese populations . Approximately 26.3 % of the global population is aged under 15 , while 65.9 % is aged 15 -- 64 and 7.9 % is aged 65 or over . The median age of the world 's population was estimated to be 29.7 years in 2014 , and is expected to rise to 37.9 years by 2050 .

 According to the World Health Organization , the global average life expectancy is 70.5 years as of 2012 , with women living an average of 73 years and men approximately 68 years . In 2010 , the global fertility rate was estimated at 2.52 children per woman . In June 2012 , British researchers calculated the total weight of Earth 's human population as approximately 287 million tonnes , with the average person weighing around 62 kilograms ( 137 lb ) .

 The CIA estimated nominal 2013 gross world product at US $74.31 trillion , giving an annual global per capita figure of around US $10,500 . Around 1.29 billion people ( 18.4 % of the world population ) live in extreme poverty , subsisting on less than US $1.25 per day ; approximately 870 million people ( 12.25 % ) are undernourished. 83 % of the world 's over-15s are considered literate . In June 2014 , there were around 3.03 billion global Internet users , constituting 42.3 % of the world population .

 The Han Chinese are the world 's largest single ethnic group , constituting over 19 % of the global population in 2011 . The world 's most - spoken first languages are Mandarin Chinese ( spoken by 12.44 % of the world 's population ) , Spanish ( 4.85 % ) , English ( 4.83 % ) , Arabic ( 3.25 % ) and Hindustani ( 2.68 % ) . The world 's largest religion is Christianity , whose adherents account for 31 % of the global population ; Islam is the second - largest religion , accounting for 24.1 % , and Hinduism the third , accounting for 13.78 % . In 2005 , around 16 % of the global population were reported to be non-religious .

 Largest populations by country ( edit )

 Further information : List of countries and dependencies by population A map of world population in 2014

 10 most populous countries

 Rank

 Country / Territory

 Population

 Date

 Approx. % of world population

 Source

 China

 1,390,570,000

 April 26 , 2018

 18.3 %

 India

 1,330,950,000

 April 26 , 2018

 17.5 %

 United States

 327,029,000

 April 26 , 2018

 4.29 %

 Indonesia

 261,600,000

 October 31 , 2016

 3.43 %

 5

 Pakistan

 211,367,000

 April 26 , 2018

 2.77 %

 6

 Brazil

 208,968,000

 April 26 , 2018

 2.74 %

 7

 Nigeria

 188,500,000

 October 31 , 2016

 2.47 %

 8

 Bangladesh

 164,394,000

 April 26 , 2018

 2.16 %

 9

 Russia

 146,773,226

 June 1 , 2017

 1.93 %

 10

 Japan

 126,670,000

 September 1 , 2017

 1.66 %

 Approximately 4.3 billion people live in these ten countries , representing around 58 % of the world 's population as of March 2016 . Approximately 3.7 billion people , or half of the world population , live in the six most populous countries .

 Most densely populated countries ( edit )

 Further information : List of countries and dependencies by population density

 The tables below list the world 's most densely populated countries , both in absolute terms and in comparison to their total populations .

 Population density ( people per km ) map of the world in 1994 . Red and pink areas denote regions of highest population density .

 10 most densely populated countries ( with population above 5 million )

 Rank

 Country

 Population

 Area ( km )

 Density ( Pop . per km )

 Singapore

 5,612,300

 710

 7,905

 Bangladesh

 164,390,000

 143,998

 1,142

 Taiwan

 23,562,318

 36,190

 651

 South Korea

 51,446,201

 99,538

 517

 5

 Lebanon

 6,082,000

 10,452

 582

 6

 Rwanda

 11,809,295

 26,338

 448

 7

 Netherlands

 17,220,000

 41,526

 415

 8

 Haiti

 10,911,819

 27,065

 403

 9

 India

 1,330,950,000

 3,287,240

 405

 10

 Israel

 8,850,000

 22,072

 401

 Countries ranking highly in both total population ( more than 20 million people ) and population density ( more than 250 people per square kilometer ) :

 Rank

 Country

 Population

 Area ( km )

 Density ( Pop . per km )

 Notes

 India

 1,330,950,000

 3,287,240

 405

 Growing population

 Pakistan

 211,370,000

 803,940

 263

 Rapidly growing population

 Bangladesh

 164,390,000

 143,998

 1,142

 Rapidly growing population

 Japan

 126,670,000

 377,873

 335

 Declining population

 5

 Philippines

 105,780,000

 300,000

 353

 Growing population

 6

 Vietnam

 93,700,000

 331,689

 282

 Growing population

 7

 United Kingdom

 65,648,100

 243,610

 269

 Slowly growing population

 8

 South Korea

 51,446,201

 99,538

 517

 Slowly growing population

 9

 Taiwan

 23,562,318

 36,190

 651

 Steady population

 10

 Sri Lanka

 21,444,000

 65,610

 327

 Growing population

 Fluctuation ( edit )

 Main articles : World population growth , Population growth , and Projections of population growth Estimates of population evolution in different continents between 1950 and 2050 , according to the United Nations . The vertical axis is logarithmic and is in millions of people .

 Population size fluctuates at differing rates in differing regions . Nonetheless , population growth is the long - standing trend on all inhabited continents , as well as in most individual states . During the 20th century , the global population saw its greatest increase in known history , rising from about 1.6 billion in 1900 to over 6 billion in 2000 . A number of factors contributed to this increase , including the lessening of the mortality rate in many countries by improved sanitation and medical advances , and a massive increase in agricultural productivity attributed to the Green Revolution .

 In 2000 , the United Nations estimated that the world 's population was growing at an annual rate of 1.14 % ( equivalent to around 75 million people ) , down from a peak of 88 million per year in 1989 . By 2000 , there were approximately ten times as many people on Earth as there had been in 1700 . Globally , the population growth rate has been steadily declining from its peak of 2.19 % in 1963 , but growth remains high in Latin America , the Middle East , and Sub-Saharan Africa .

 A world map showing global variations in fertility rate per woman , according to the CIA World Factbook 's 2015 data .

 7 -- 8 children 6 -- 7 children

 5 -- 6 children 4 -- 5 children

 3 -- 4 children 2 -- 3 children

 1 -- 2 children 0 -- 1 children

 During the 2010s , Japan and some countries in Europe began to encounter negative population growth ( i.e. a net decrease in population over time ) , due to sub-replacement fertility rates .

 In 2006 , the United Nations stated that the rate of population growth was visibly diminishing due to the ongoing global demographic transition . If this trend continues , the rate of growth may diminish to zero by 2050 , concurrent with a world population plateau of 9.2 billion . However , this is only one of many estimates published by the UN ; in 2009 , UN population projections for 2050 ranged between around 8 billion and 10.5 billion . An alternative scenario is given by the statistician Jorgen Randers , who argues that traditional projections insufficiently take into account the downward impact of global urbanization on fertility . Randers ' `` most likely scenario '' reveals a peak in the world population in the early 2040s at about 8.1 billion people , followed by decline . Adrian Raftery , a University of Washington professor of statistics and of sociology , states that `` there 's a 70 percent probability the world population will not stabilize this century . Population , which had sort of fallen off the world 's agenda , remains a very important issue . ''

 Estimated world population figures , 10,000 BC -- AD 2000

 Estimated world population figures , 10,000 BC -- AD 2000 ( in log y scale )

 World population figures , 1950 -- 2000

 Estimated global growth rates , 1950 -- 2050

 Estimated and projected populations of the world and its continents ( except Antarctica ) from 1950 to 2100 . The shaded regions correspond to the range of projections by the United Nations Department of Economic and Social Affairs .

 Population growth by region ( edit )

 Main article : World population growth Further information : Total fertility rate and Birth rate

 The table below shows historical and predicted regional population figures in millions . The availability of historical population figures varies by region .

 World historical and predicted populations ( in millions )

 Region

 1500

 1600

 1700

 1750

 1800

 1850

 1900

 1950

 1999

 2008

 2012

 2050

 2150

 World

 585

 660

 710

 791

 978

 1,262

 1,650

 2,521

 6,008

 6,707

 6,896

 7,052

 9,725

 9,746

 Africa

 86

 114

 106

 106

 107

 111

 133

 221

 783

 973

 1,022

 1,052

 2,478

 2,308

 Asia

 282

 350

 411

 502

 635

 809

 947

 1,402

 3,700

 4,054

 4,164

 4,250

 5,267

 5,561

 Europe

 168

 170

 178

 190

 203

 276

 408

 547

 675

 732

 738

 740

 734

 517

 Latin America

 40

 20

 10

 16

 24

 38

 74

 167

 508

 577

 590

 603

 784

 912

 North America

 6

 7

 26

 82

 172

 312

 337

 345

 351

 433

 398

 Oceania

 6

 13

 30

 34

 37

 38

 57

 51

 World historical and predicted populations by percentage distribution

 Region

 1500

 1600

 1700

 1750

 1800

 1850

 1900

 1950

 1999

 2008

 2012

 2050

 2150

 World

 100

 100

 100

 100

 100

 100

 100

 100

 100

 100

 100

 100

 100

 100

 Africa

 14.7

 17.3

 14.9

 13.4

 10.9

 8.8

 8.1

 8.8

 13.0

 14.5

 14.8

 15.2

 25.48

 23.7

 Asia

 48.2

 53.0

 57.9

 63.5

 64.9

 64.1

 57.4

 55.6

 61.6

 60.4

 60.4

 60.3

 54.16

 57.1

 Europe

 28.7

 25.8

 25.1

 20.6

 20.8

 21.9

 24.7

 21.7

 11.2

 10.9

 10.7

 10.5

 7.55

 5.3

 Latin America

 6.8

 3.0

 1.4

 2.0

 2.5

 3.0

 4.5

 6.6

 8.5

 8.6

 8.6

 8.6

 8.06

 9.4

 North America

 1.0

 0.5

 0.3

 0.3

 0.7

 2.1

 5.0

 6.8

 5.2

 5.0

 5.0

 5.0

 4.45

 4.1

 Oceania

 0.5

 0.5

 0.4

 0.3

 0.2

 0.2

 0.4

 0.5

 0.5

 0.5

 0.5

 0.5

 0.59

 0.5

 Past population ( edit )

 The following table gives estimates , in millions , of population in the past . The data for 1750 to 1900 are from the UN report `` The World at Six Billion '' whereas the data from 1950 to 2015 are from a UN data sheet .

 Year

 World

 Africa

 Asia

 Europe

 Latin America & Carib .

 North America

 Oceania

 Notes

 70,000 BC

 < 0.015

 0

 0

 10,000 BC

 8000 BC

 5

 6500 BC

 5

 5000 BC

 5

 4000 BC

 7

 3000 BC

 14

 2000 BC

 27

 1000 BC

 50

 7

 33

 9

 500 BC

 100

 14

 66

 16

 AD 1

 200

 23

 141

 28

 1000

 400

 70

 269

 50

 8

 1500

 458

 86

 243

 84

 39

 1600

 580

 114

 339

 111

 10

 1700

 682

 106

 436

 125

 10

 1750

 791

 106

 502

 163

 16

 1800

 1,000

 107

 656

 203

 24

 7

 1850

 1,262

 111

 809

 276

 38

 26

 1900

 1,650

 133

 947

 408

 74

 82

 6

 1950

 2,525

 229

 1,394

 549

 169

 172

 12.7

 1955

 2,758

 254

 1,534

 577

 193

 187

 14.2

 1960

 3,018

 285

 1,687

 606

 221

 204

 15.8

 1965

 3,322

 322

 1,875

 635

 254

 219

 17.5

 1970

 3,682

 366

 2,120

 657

 288

 231

 19.7

 4,061

 416

 2,378

 677

 326

 242

 21.5

 1980

 4,440

 478

 2,626

 694

 365

 254

 23.0

 1985

 4,853

 550

 2,897

 708

 406

 267

 24.9

 5,310

 632

 3,202

 721

 447

 281

 27.0

 1995

 5,735

 720

 3,475

 728

 487

 296

 29.1

 2000

 6,127

 814

 3,714

 726

 527

 314

 31.1

 2005

 6,520

 920

 3,945

 729

 564

 329

 33.4

 6,930

 1,044

 4,170

 735

 600

 344

 36.4

 2015

 7,349

 1,186

 4,393

 738

 634

 358

 39.3

 Using the above figures , the change in population from 2010 to 2015 was :

 World : + 420 million

 Africa : + 142 million

 Asia : + 223 million

 Europe : + 3 million

 Latin America and Caribbean : + 35 million

 Northern America : + 14 million

 Oceania : + 2.9 million

 ^ Jump up to : Northern America comprises the northern-most countries and territories of North America : Canada , the United States , Greenland , Bermuda , and St. Pierre and Miquelon . Latin America comprises Mexico , Central America , the Caribbean , and South America .

 Projections ( edit )

 Main articles : World population estimates and Projections of population growth

 Long - term global population growth is difficult to predict . The United Nations and the US Census Bureau both give different estimates -- according to the UN , the world population reached seven billion in late 2011 , while the USCB asserted that this occurred in March 2012 . The UN has issued multiple projections of future world population , based on different assumptions . From 2000 to 2005 , the UN consistently revised these projections downward , until the 2006 revision , issued on March 14 , 2007 , revised the 2050 mid-range estimate upwards by 273 million .

 Average global birth rates are declining fast , but vary greatly between developed countries ( where birth rates are often at or below replacement levels ) and developing countries ( where birth rates typically remain high ) . Different ethnicities also display varying birth rates . Death rates can change rapidly due to disease epidemics , wars and other mass catastrophes , or advances in medicine .

 2012 United projections show a continued increase in population in the near future with a steady decline in population growth rate ; the global population is expected to reach between 8.3 and 10.9 billion by 2050 . 2003 UN Population Division population projections for the year 2150 range between 3.2 and 24.8 billion . One of many independent mathematical models supports the lower estimate , while a 2014 estimate forecasts between 9.3 and 12.6 billion in 2100 , and continued growth thereafter . Some analysts have questioned the sustainability of further world population growth , highlighting the growing pressures on the environment , global food supplies , and energy resources .

 UN ( medium variant -- 2012 revision ) and US Census Bureau ( June 2015 ) estimates

 Year

 UN est . ( millions )

 Difference

 USCB est . ( millions )

 Difference

 2005

 6,514

 --

 6,473

 --

 6,916

 402

 6,866

 393

 2015

 7,324

 408

 7,256

 390

 2020

 7,717

 393

 7,643

 380

 2025

 8,083

 366

 8,007

 363

 2030

 8,425

 342

 8,341

 334

 2035

 8,743

 318

 8,646

 306

 2040

 9,039

 296

 8,926

 280

 2045

 9,308

 269

 9,180

 254

 2050

 9,551

 243

 9,408

 228

 UN 2012 estimates and medium variant projections ( in millions )

 Year

 World

 Asia

 Africa

 Europe

 Latin America / Caribbean

 Northern America

 Oceania

 6,916

 4,165 ( 60.2 % )

 1,031 ( 14.9 % )

 740 ( 10.7 % )

 596 ( 8.6 % )

 347 ( 5.0 % )

 37 ( 0.5 % )

 2015

 7,324

 4,385 ( 59.9 % )

 1,166 ( 15.9 % )

 743 ( 10.1 % )

 630 ( 8.6 % )

 361 ( 4.9 % )

 39 ( 0.5 % )

 2020

 7,717

 4,582 ( 59.4 % )

 1,312 ( 17.0 % )

 744 ( 9.6 % )

 662 ( 8.6 % )

 376 ( 4.9 % )

 42 ( 0.5 % )

 2025

 8,083

 4,749 ( 58.8 % )

 1,468 ( 18.2 % )

 741 ( 9.2 % )

 691 ( 8.5 % )

 390 ( 4.8 % )

 45 ( 0.6 % )

 2030

 8,425

 4,887 ( 58.0 % )

 1,634 ( 19.4 % )

 736 ( 8.7 % )

 717 ( 8.5 % )

 403 ( 4.8 % )

 47 ( 0.6 % )

 2035

 8,743

 4,997 ( 57.2 % )

 1,812 ( 20.7 % )

 730 ( 8.3 % )

 739 ( 8.5 % )

 415 ( 4.8 % )

 50 ( 0.6 % )

 2040

 9,039

 5,080 ( 56.2 % )

 1,999 ( 22.1 % )

 724 ( 8.0 % )

 757 ( 8.4 % )

 426 ( 4.8 % )

 52 ( 0.6 % )

 2045

 9,308

 5,136 ( 55.2 % )

 2,194 ( 23.6 % )

 717 ( 7.7 % )

 771 ( 8.3 % )

 436 ( 4.7 % )

 55 ( 0.6 % )

 2050

 9,551

 5,164 ( 54.1 % )

 2,393 ( 25.1 % )

 709 ( 7.4 % )

 782 ( 8.2 % )

 446 ( 4.7 % )

 57 ( 0.6 % )

 2055

 9,766

 5,168 ( 52.9 % )

 2,595 ( 26.6 % )

 700 ( 7.2 % )

 788 ( 8.1 % )

 456 ( 4.7 % )

 59 ( 0.6 % )

 2060

 9,957

 5,152 ( 51.7 % )

 2,797 ( 28.1 % )

 691 ( 6.9 % )

 791 ( 7.9 % )

 465 ( 4.7 % )

 61 ( 0.6 % )

 2065

 10,127

 5,120 ( 50.6 % )

 2,998 ( 29.6 % )

 681 ( 6.7 % )

 791 ( 7.8 % )

 474 ( 4.7 % )

 63 ( 0.6 % )

 2070

 10,277

 5,075 ( 49.4 % )

 3,195 ( 31.1 % )

 673 ( 6.5 % )

 788 ( 7.6 % )

 482 ( 4.7 % )

 64 ( 0.6 % )

 2075

 10,409

 5,019 ( 48.2 % )

 3,387 ( 32.5 % )

 665 ( 6.4 % )

 783 ( 7.5 % )

 490 ( 4.7 % )

 66 ( 0.6 % )

 2080

 10,524

 4,957 ( 47.1 % )

 3,570 ( 33.9 % )

 659 ( 6.3 % )

 776 ( 7.4 % )

 496 ( 4.7 % )

 67 ( 0.6 % )

 2085

 10,626

 4,894 ( 46.1 % )

 3,742 ( 35.2 % )

 653 ( 6.1 % )

 767 ( 7.2 % )

 502 ( 4.7 % )

 68 ( 0.6 % )

 2090

 10,717

 4,833 ( 45.1 % )

 3,903 ( 36.4 % )

 649 ( 6.1 % )

 757 ( 7.1 % )

 506 ( 4.7 % )

 69 ( 0.6 % )

 2095

 10,794

 4,773 ( 44.2 % )

 4,051 ( 37.6 % )

 644 ( 6.0 % )

 747 ( 6.9 % )

 510 ( 4.7 % )

 69 ( 0.6 % )

 2100

 10,854

 4,712 ( 43.4 % )

 4,185 ( 38.6 % )

 639 ( 5.9 % )

 736 ( 6.8 % )

 513 ( 4.7 % )

 70 ( 0.6 % )

 Mathematical approximations ( edit )

 In 1975 , Sebastian von Hoerner proposed a formula for population growth which represented hyperbolic growth with an infinite population in 2025 . The hyperbolic growth of the world population observed until the 1970s was later correlated to a non-linear second order positive feedback between demographic growth and technological development . This feedback can be described as follows : technological advance → increase in the carrying capacity of land for people → demographic growth → more people → more potential inventors → acceleration of technological advance → accelerating growth of the carrying capacity → faster population growth → accelerating growth of the number of potential inventors → faster technological advance → hence , the faster growth of the Earth 's carrying capacity for people , and so on . The transition from hyperbolic growth to slower rates of growth is related to the demographic transition .

 According to the Russian demographer Sergey Kapitsa , the world population grew between 67,000 BC and 1965 according to the following formula :

 N = C τ arccot  T 0 − T τ ( \ displaystyle N = ( \ frac ( C ) ( \ tau ) ) \ operatorname ( arccot ) ( \ frac ( T_ ( 0 ) - T ) ( \ tau ) ) )

 where

 N is current population

 T is the current year

 C = ( 1.86 ± 0.01 ) 10

 T = 2007 ± 1

 τ ( \ displaystyle \ tau ) = 42 ± 1

 Years for world population to double ( edit )

 According to linear interpolation and extrapolation of UNDESA population estimates , the world population has doubled , or will double , in the years listed in the tables below ( with two different starting points ) . During the 2nd millennium , each doubling took roughly half as long as the previous doubling , fitting the hyperbolic growth model mentioned above . However , after 2024 , it is unlikely that there will be another doubling of the global population in the 21st century .

 Historic chart showing the periods of time the world population has taken to double , from 1700 to 2000

 Starting at 500 million

 Population ( in billions )

 0.5

 8

 Year

 1500

 1804

 1927

 2024

 Years elapsed

 304

 123

 47

 50

 Starting at 375 million

 Population ( in billions )

 0.375

 0.75

 1.5

 6

 Year

 1171

 1715

 1881

 1960

 1999

 Years elapsed

 544

 166

 79

 39

 Overpopulation ( edit )

 Main articles : Human overpopulation and Malthusian catastrophe

 Predictions of scarcity ( edit )

 Greater Los Angeles lies on a coastal mediterranean savannah with a small watershed that is able to support at most one million people on its own water ; as of 2015 , the area has a population of over 18 million . Researchers predict that similar cases of resource scarcity will grow more common as the world population increases .

 In his 1798 work An Essay on the Principle of Population , the British scholar Thomas Malthus incorrectly predicted that continued population growth would exhaust the global food supply by the mid-19th century . Malthus wrote the essay to refute what he considered the unattainable utopian ideas of William Godwin and Marquis de Condorcet , as presented in Political Justice and The Future Progress of the Human Mind . In 1968 , Paul R. Ehrlich reprised Malthus ' argument in The Population Bomb , predicting that mass global famine would occur in the 1970s and 1980s .

 The predictions of Ehrlich and other neo-Malthusians were vigorously challenged by a number of economists , notably Julian Lincoln Simon , and advances in agriculture , collectively known as the Green Revolution , forestalled any potential global famine in the late 20th century . Between 1950 and 1984 , as the Green Revolution transformed agriculture around the world , grain production increased by over 250 % . The world population has grown by over four billion since the beginning of the Green Revolution , but food production has so far kept pace with population growth . Most scholars believe that , without the Revolution , there would be greater levels of famine and malnutrition than the UN presently documents . However , neo-Malthusians point out that fossil fuels provided the energy for the Green Revolution , in the form of natural gas - derived fertilizers , oil - derived pesticides , and hydrocarbon - fueled irrigation , and that many crops have become so genetically uniform that a crop failure in any one country could potentially have global repercussions .

 In 2004 , a meta - analysis of 70 quantitative studies estimating a sustainable limit to the world population generated a meta - estimate of 7.7 billion people .

 Graph of the global human population from 10,000 BC to AD 2000 , from the US Census Bureau . The graph shows the extremely rapid growth in the world population that has taken place since the 18th century . The human population has been growing rapidly since the mid-1800s .

 In May 2008 , the price of grain was pushed up severely by the increased cultivation of biofuels , the increase of world oil prices to over $140 per barrel ( $880 / m ) , global population growth , the effects of climate change , the loss of agricultural land to residential and industrial development , and growing consumer demand in the population centres of China and India . Food riots subsequently occurred in some countries . However , oil prices then fell sharply . Resource demands are expected to ease as population growth declines , but it is unclear whether mass food wastage and rising living standards in developing countries will once again create resource shortages .

 David Pimentel , professor of ecology and agriculture at Cornell University , estimates that the sustainable agricultural carrying capacity for the United States is about 200 million people ; its population as of 2015 is over 300 million . In 2009 , the UK government 's chief scientific advisor , Professor John Beddington , warned that growing populations , falling energy reserves and food shortages would create a `` perfect storm '' of shortages of food , water , and energy by 2030 . According to a 2009 report by the United Nations Food and Agriculture Organisation ( FAO ) , the world will have to produce 70 % more food by 2050 to feed a projected extra 2.3 billion people .

 The observed figures for 2007 showed an actual increase in absolute numbers of undernourished people in the world , with 923 million undernourished in 2007 , versus 832 million in 1995 . The 2009 FAO estimates showed an even more dramatic increase , to 1.02 billion .

 Environmental impacts ( edit )

 Illegal slash - and - burn agriculture in Madagascar , 2010

 A number of scientists have argued that the current global population expansion and accompanying increase in resource consumption threatens the world 's ecosystem . The InterAcademy Panel Statement on Population Growth , which was ratified by 58 member national academies in 1994 , states that `` unprecedented '' population growth aggravates many environmental problems , including rising levels of atmospheric carbon dioxide , global warming , and pollution . Indeed , some analysts claim that overpopulation 's most serious impact is its effect on the environment . The situation has continued to worsen , as at the time of the 1994 IAP statement , the world population stood at 5.5 billion and lower - bound scenarios predicted a peak of 7.8 billion by 2050 , a number that current estimates state will be reached in the late 2020s .

 Scientists contend that human overpopulation , continued human population growth and overconsumption , particularly by the wealthy , are the primary drivers of mass species extinction . By 2050 population growth , along with profligate consumption , could result in oceans containing more plastic than fish by weight . In November 2017 , a statement by 15,364 scientists from 184 countries asserted that rapid human population growth is the `` primary driver behind many ecological and even societal threats . ''

 A July 2017 study published in Environmental Research Letters argued that the most significant way individuals could mitigate their own carbon footprint is to have fewer children , followed by living without a vehicle , forgoing air travel and adopting a plant - based diet .

 Population control ( edit )

 Main article : Human population planning India is predicted to overtake China as the world 's most populous country by 2022 .

 Human population control is the practice of intervening to alter the rate of population growth . Historically , human population control has been implemented by limiting a region 's birth rate , by voluntary contraception or by government mandate . It has been undertaken as a response to factors including high or increasing levels of poverty , environmental concerns , and religious reasons . The use of abortion in some population control strategies has caused controversy , with religious organizations such as the Roman Catholic Church explicitly opposing any intervention in the human reproductive process .

 The University of Nebraska publication Green Illusions argues that population control to alleviate environmental pressures need not be coercive . It states that `` Women who are educated , economically engaged , and in control of their own bodies can enjoy the freedom of bearing children at their own pace , which happens to be a rate that is appropriate for the aggregate ecological endowment of our planet . '' The book Fatal Misconception by Matthew Connelly similarly points to the importance of supporting the rights of women in bringing population levels down over time .

 Overpopulation skepticism ( edit )

 The Population Research Institute ( PRI ) , an anti-abortion , anti-contraception advocacy group , has criticised predictions of overpopulation and attendant resource scarcity , with some describing overpopulation as a `` myth '' . The PRI argues that advances in agricultural , medical , and industrial technology have allowed global economic productivity to keep pace with rising populations despite Malthusian predictions to the contrary . PRI further says that family sizes are naturally declining worldwide due to higher living standards , increased availability of contraception and better economic opportunities for women . However , other commentators have described PRI 's arguments on overpopulation as deceptive .

 See also ( edit )

 Anthropocene

 Birth control

 Coastal population growth

 Demographic transition

 Depopulation

 Doomsday argument

 Family planning

 Food security

 Megacity

 Natalism

 One - child policy

 Population boom

 Population Matters , population control think tank and campaign group

 Population Reference Bureau , population demographics and annual World Population Data Sheet

 Two - child policy

 World 's largest cities

 Lists :

 List of countries and dependencies by population

 List of urban areas by population

 List of population concern organizations

 List of countries by fertility rate

 List of countries by future population ( United Nations , medium fertility variant )

 List of countries by past and future population

 List of countries by population in 1900

 List of countries by population density

 List of countries by population growth rate

 Lists of organisms by population -- for non-human global populations

 List of religious populations

 Historical :

 Historical censuses

 Historical demography

 Notes ( edit )

 Jump up ^ Excluding its Special Administrative Regions ( SARs ) of Hong Kong and Macau .

 Jump up ^ Including Central America and the Caribbean .

 Jump up ^ The Antarctic Treaty System limits the nature of national claims in Antarctica . Of the territorial claims in Antarctica , the Ross Dependency has the largest population .

 Jump up ^ Figure refers to Mainland China only . It excludes Taiwan and the special administrative regions of Hong Kong and Macau .

 Jump up ^ Figure including Crimea and Sevastopol .

 References ( edit )

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 Jump up ^ `` The population of the world , which Sir W.P. in 1682 , stated at only 320 millions , has been estimated by some writers at about 730 millions , by others , at upwards of 900 millions ; Mr. Wallace , of Edinburgh , conjectured it might amount to 1000 millions , and this number has since generally been adopted who have noticed the subject ; '' The Monthly Magazine 4 ( July -- December 1797 ) , p. 167 .

 Jump up ^ 600 million : Simon Gray , The Happiness of States ( 1818 ) , p. 356 . 800 million : Gordon Hall , Samuel Newell , The Conversion of the World ( 1818 ) , p. 10 . 800 to 1000 million : John Redman Coxe , Considerations Respecting the Recognition of Friends in Another World ( 1845 ) , p. 21 ( footnote with references ) .

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 `` Ch. 5 : Population Size and Composition '' . World Population Prospects , the 2000 Revision ( PDF ) . Vol. III . United Nations Population Division . p. 171 . Retrieved July 3 , 2010 .

 `` Executive Summary '' . World Population Prospects : The 2002 Revision Volume III : Analytical Report ( PDF ) . 2002 . Retrieved July 3 , 2010 .

 `` World Population to 2300 '' ( PDF ) . New York : United Nations Department of Economic and Social Affairs : Population Division . 2004 : 3 , 14 . Retrieved July 3 , 2010 .

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 Jump up ^ `` World Population Prospects , the 2008 Revision -- Frequently Asked Questions '' . Population Division of the Department of Economic and Social Affairs of the United Nations Secretariat . November 10 , 2010 . Retrieved March 26 , 2015 .

 ^ Jump up to : `` World Health Statistics 2014 : Large gains in life expectancy '' . World Health Organization . May 15 , 2014 . Retrieved March 14 , 2015 .

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 Jump up ^ `` What It Will Take to ' Graduate ' 1.2 Billion People Out of Extreme Poverty '' . The Huffington Post . April 4 , 2012 . Retrieved April 26 , 2012 .

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 Jump up ^ `` World 's Most Typical Person : Han Chinese Man '' . Wall Street Journal . March 4 , 2011 . Retrieved November 18 , 2011 .

 Jump up ^ Religions by adherents . Adherents.com. 2005 data . Retrieved December 19 , 2011 .

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 Jump up ^ `` Official estimate ( including Crimea and Sevastopol ) '' . GKS.ru . Retrieved September 1 , 2017 .

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 ^ Jump up to : Figures include the former Soviet countries in Europe . Caselli , Graziella ; Gillaume Wunsch ; Jacques Vallin ( December 20 , 2005 ) . Demography : Analysis and Synthesis , Four Volume Set : A Treatise in Population . Academic Press . p. 42 . ISBN 978 - 0 - 12 - 765660 - 1 .

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 Jump up ^ `` World Population Prospects The 2015 Revision '' ( PDF ) .

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 Jump up ^ Fewer than 15,000 individuals , according to the Toba catastrophe theory , though this theory has been criticized by some scientists . See : `` Toba super-volcano catastrophe idea `` dismissed '' `` . BBC News . April 30 , 2013 . Retrieved March 21 , 2015 .

 Jump up ^ An approximation based on figures from different sources as listed at the US Census Bureau 's Historical Estimates of World Population ; see also * Kremer , Michael ( 1993 ) . `` Population Growth and Technological Change : One Million B.C. to 1990 '' . The Quarterly Journal of Economics . 108 ( 3 ) : 681 -- 716 . doi : 10.2307 / 2118405 . JSTOR 2118405 .

 Jump up ^ An approximation based on figures from different sources as listed at the US Census Bureau 's Total Midyear Population for the World : 1950 - 2050

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 Jump up ^ `` World population projected to reach 9.6 billion by 2050 -- UN report '' . UN News Centre . June 14 , 2013 . Retrieved June 16 , 2013 .

 Jump up ^ `` A model predicts that the world 's populations will stop growing in 2050 '' . ScienceDaily.com. April 4 , 2013 . Retrieved June 3 , 2013 .

 Jump up ^ Carrington , Damien ( September 18 , 2014 ) . `` World population to hit 12bn in 2100 -- with 70 % chance of continuous rise '' . The Guardian . Retrieved September 21 , 2014 .

 Jump up ^ Gerland , P. ; Raftery , A.E. ; Ev Ikova , H. ; Li , N. ; Gu , D. ; Spoorenberg , T. ; Alkema , L. ; Fosdick , B.K. ; Chunn , J. ; Lalic , N. ; Bay , G. ; Buettner , T. ; Heilig , G.K. ; Wilmoth , J. ( September 14 , 2014 ) . `` World population stabilization unlikely this century '' . Science . AAAS. 346 ( 6206 ) : 234 -- 7 . Bibcode : 2014Sci ... 346 ... 234G . doi : 10.1126 / science. 1257469 . ISSN 1095 - 9203 . PMC 4230924 . PMID 25301627 . Retrieved September 21 , 2014 .

 Jump up ^ Peter P. Rogers ; Kazi F. Jalal & John A. Boyd ( 2008 ) . An Introduction To Sustainable Development . Earthscan via Google Books . p. 53 . ISBN 9781849770477 .

 ^ Jump up to : `` Overpopulation 's Real Victim Will Be the Environment '' . TIME . October 26 , 2011 . Retrieved February 18 , 2013 .

 Jump up ^ Zehner , Ozzie ( 2012 ) . Green Illusions . Lincoln and London : University of Nebraska Press . pp. 187 -- 331 .

 ^ Jump up to : `` World Population Prospects : The 2012 Revision '' ( XLS ) . Population Division of the Department of Economic and Social Affairs of the United Nations Secretariat . June 2013 . Retrieved August 7 , 2013 .

 Jump up ^ `` World Population -- Total Midyear Population for the World : 1950 -- 2050 '' . Census.gov . July 2015 . Retrieved March 7 , 2016 .

 Jump up ^ Sebastien von Hoerner ( 1975 ) . `` Population Explosion and Interstellar Expansion '' . Journal of the British Interplanetary Society ( 28 ) : 691 -- 712 .

 Jump up ^ Introduction to Social Macrodynamics . Andrey Korotayev et al . For a rigorous mathematical analysis of this issue , see `` A Compact Mathematical Model of the World System Economic and Demographic Growth , 1 CE -- 1973 CE '' .

 Jump up ^ Kapitsa , Sergei P. ( 1996 ) . `` The phenomenological theory of world population growth '' . Physics - Uspekhi. 39 ( 1 ) : 57 -- 71 . doi : 10.1070 / pu1996v039n01abeh000127 . Archived from the original on May 11 , 2009 . Retrieved 2013 - 07 - 26 .

 Jump up ^ Lutz , Wolfgang ; Sanderson , Warren ; Scherbov , Sergei ( 1997 - 06 - 19 ) . `` Doubling of world population unlikely '' . Nature . 387 ( 6635 ) : 803 -- 805 . doi : 10.1038 / 42935 . PMID 9194559 . Retrieved 2012 - 10 - 23 .

 ^ Jump up to : `` World faces ' perfect storm ' of problems by 2030 , chief scientist to warn '' . The Guardian . March 18 , 2009 . Retrieved February 18 , 2013 .

 Jump up ^ Jowit , Juliette ( October 23 , 2011 ) . `` Paul Ehrlich , a prophet of global population doom who is gloomier than ever '' . The Guardian . London . Retrieved July 22 , 2013 .

 Jump up ^ Kindall , Henery W & Pimentel , David ( May 1994 ) . `` Constraints on the Expansion of the Global Food Supply '' . Ambio. 23 ( 3 ) .

 Jump up ^ `` The limits of a Green Revolution ? '' . BBC News . March 29 , 2007 . Retrieved February 18 , 2013 .

 Jump up ^ `` Host Plant Resistance and Conservation of Genetic Diversity '' . Radcliffe 's IPM World Textbook . University of Minnesota . March 2013 . Retrieved July 20 , 2013 .

 Jump up ^ van den Bergh , Jeroen C.J.M. ; Rietveld , Piet ( 2004 ) . `` Reconsidering the Limits to World Population : Meta - analysis and Meta - prediction '' . BioScience. 54 ( 3 ) : 195 . doi : 10.1641 / 0006 - 3568 ( 2004 ) 054 ( 0195 : RTLTWP ) 2.0.CO ; 2 . ISSN 0006 - 3568 .

 Jump up ^ `` The global grain bubble '' . Christian Science Monitor . January 18 , 2008 . Retrieved February 18 , 2013 .

 Jump up ^ James Randerson , science correspondent ( March 7 , 2008 ) . `` Food crisis will take hold before climate change , warns chief scientist '' . The Guardian . London . Retrieved February 18 , 2013 .

 Jump up ^ John Vidal , environment editor ( November 3 , 2007 ) . `` Global food crisis looms as climate change and fuel shortages bite '' . The Guardian . London . Retrieved February 18 , 2013 . CS1 maint : Extra text : authors list ( link )

 Jump up ^ Walsoft ( February 22 , 2008 ) . `` Experts : Global Food Shortages Could ' Continue for Decades ' '' . Marketoracle.co.uk . Retrieved February 18 , 2013 .

 Jump up ^ Moya K. Mason . `` Has Urbanization Caused a Loss to Agricultural Land ? '' . Moyak.com . Retrieved July 9 , 2013 .

 Jump up ^ Walt , Vivienne ( February 27 , 2008 ) . `` The World 's Growing Food - Price Crisis '' . Time . Retrieved February 18 , 2013 .

 Jump up ^ `` The cost of food : Facts and figures '' . BBC . October 16 , 2008 . Retrieved February 18 , 2013 .

 Jump up ^ Julian Borger ( February 26 , 2008 ) . `` Feed the world ? We are fighting a losing battle , UN admits '' . The Guardian . London . Retrieved February 18 , 2013 .

 Jump up ^ Buchanan , Emily ( April 22 , 2008 ) . `` Assessing the global food crisis '' . BBC News . Retrieved April 6 , 2010 .

 Jump up ^ `` Half of all food ' wasted ' report claims '' . BBC . January 10 , 2013 . Retrieved January 10 , 2013 .

 Jump up ^ `` Oil shock could push world food prices higher '' . CNN Money . March 3 , 2011 . Retrieved February 18 , 2013 .

 Jump up ^ P. Crabbè ( 2000 ) . Implementing ecological integrity : restoring regional and global environmental and human health . North Atlantic Treaty Organization Scientific Affairs Division / Springer . p. 411 . ISBN 0 - 7923 - 6351 - 5 .

 Jump up ^ `` Global crisis ' to strike by 2030 '' . BBC News . March 19 , 2009 . Retrieved February 18 , 2013 .

 Jump up ^ `` Global food production will have to increase 70 % for additional 2.3 billion people by 2050 '' . Finfacts.com . September 24 , 2009 . Retrieved February 18 , 2013 .

 Jump up ^ `` The State of Food Insecurity in the World , 2008 : High food prices and food security -- threats and opportunities '' . UN Food and Agriculture Organization -- Economic and Social Development Department . 2008 . p. 2 . Retrieved December 8 , 2012 .

 Jump up ^ `` One sixth of humanity undernourished -- more than ever before '' . Food and Agriculture Organization of the United Nations . 2009 . Retrieved December 8 , 2012 .

 Jump up ^ `` Ecological Debt Day '' . Archived from the original on December 17 , 2008 . Retrieved February 18 , 2013 .

 Jump up ^ `` Planetary Boundaries : Specials '' . Nature . September 23 , 2009 . Retrieved February 18 , 2013 .

 Jump up ^ `` IAP ( login required ) '' . InterAcademies.net . Archived from the original on February 10 , 2010 . Retrieved February 18 , 2013 .

 Jump up ^ Pimm , S.L. ; Jenkins , C.N. ; Abell , R. ; Brooks , T.M. ; Gittleman , J.L. ; Joppa , L.N. ; Raven , P.H. ; Roberts , C.M. ; Sexton , J.O. ( 30 May 2014 ) . `` The biodiversity of species and their rates of extinction , distribution , and protection '' ( PDF ) . Science . 344 ( 6187 ) : 1246752 . doi : 10.1126 / science. 1246752 . PMID 24876501 . Retrieved 15 December 2016 . The overarching driver of species extinction is human population growth and increasing per capita consumption .

 Jump up ^ Ceballos , Gerardo ; Ehrlich , Paul R. ; Barnosky , Anthony D. ; García , Andrés ; Pringle , Robert M. ; Palmer , Todd M. ( 2015 ) . `` Accelerated modern human -- induced species losses : Entering the sixth mass extinction '' . Science Advances. 1 ( 5 ) : e1400253 . Bibcode : 2015SciA ... 1E0253C . doi : 10.1126 / sciadv. 1400253 .

 ^ Jump up to : Sutter , John D. ( December 12 , 2016 ) . `` How to stop the sixth mass extinction '' . CNN . Retrieved December 19 , 2016 .

 Jump up ^ Ceballos , Gerardo ; Ehrlich , Paul R ; Dirzo , Rodolfo ( 23 May 2017 ) . `` Biological annihilation via the ongoing sixth mass extinction signaled by vertebrate population losses and declines '' . PNAS. 114 : 201704949 . doi : 10.1073 / pnas. 1704949114 . PMC 5544311 . PMID 28696295 . Much less frequently mentioned are , however , the ultimate drivers of those immediate causes of biotic destruction , namely , human overpopulation and continued population growth , and overconsumption , especially by the rich . These drivers , all of which trace to the fiction that perpetual growth can occur on a finite planet , are themselves increasing rapidly .

 Jump up ^ Ripple WJ , Wolf C , Newsome TM , Galetti M , Alamgir M , Crist E , Mahmoud MI , Laurance WF ( 13 November 2017 ) . `` World Scientists ' Warning to Humanity : A Second Notice '' . BioScience . doi : 10.1093 / biosci / bix125 .

 Jump up ^ Perkins , Sid ( July 11 , 2017 ) . `` The best way to reduce your carbon footprint is one the government is n't telling you about '' . Science . Retrieved December 9 , 2017 .

 Jump up ^ Some population control programs , such as China 's one - child policy , entail the use of forced late - term abortions , sparking domestic anger and international condemnation : `` China one - child policy leads to forced abortions , mothers ' deaths '' . Los Angeles Times . June 15 , 2012 . Retrieved August 29 , 2012 .

 Jump up ^ `` Fighting poverty to build peace '' . Vatican . January 1 , 2009 . Retrieved October 24 , 2011 .

 Jump up ^ Zehmer , Ozzie ( 2012 ) . Green lllusions . Lincoln and London : University of Nebraska . p. 188 .

 Jump up ^ Connelly , Matthew ( 2008 ) . Fatal Misconception : The Struggle to Control World Population . Harvard University Press via Google Books . ISBN 9780674029835 .

 Jump up ^ `` Debunking the Myth of Overpopulation '' . Population Research Institute . 2013 . Retrieved February 19 , 2014 .

 Jump up ^ `` IAP Statement on Population and Consumption '' . InterAcademy Panel : The Global Network of Science Academies ( IAP ) . June 14 , 2012 . Retrieved March 13 , 2015 .

 Jump up ^ `` A Response to Critics of Family Planning Programs '' . Guttmacher.org . March 1 , 2009 . Retrieved November 18 , 2014 .

 Jump up ^ `` Global Environment Outlook -- Environment for the future we want '' ( PDF ) . UNEP . May 2012 . Retrieved November 18 , 2014 .

 External links ( edit )

 Wikimedia Commons has media related to World population statistics .

 Further reading

 Cohen , Joel E. ( 1995 ) . How Many People Can The Earth Support ? . New York : W.W. Norton . ISBN 0 - 393 - 31495 - 2 .

 `` World Population Prospects , the 2012 Revision '' . United Nations Population Division . Retrieved May 19 , 2014 .

 `` World Population Prospects , the 2010 Revision '' . United Nations Population Division . Retrieved June 25 , 2013 .

 `` World Population History Graph '' World population graph 10000 BC - AD 1950 .

 `` Symptoms of The Global Demographic Decline '' . Demographia.ru . Retrieved June 25 , 2013 .

 World Factbook 2012 . US Central Intelligence Agency ( CIA ) . Retrieved November 6 , 2012 .

 `` The World in Balance '' ( transcript ) . Two - part PBS Nova on world population . April 20 , 2004 . Retrieved July 19 , 2013 .

 `` The Environmental Politics of Population and Overpopulation '' . University of California , Berkeley . 2012 . Retrieved July 19 , 2013 .

 `` Global population : Faces of the future '' . The Economist . June 22 , 2013 . Retrieved June 25 , 2013 .

 `` Creating new life -- and other ways to feed the world '' . BBC . July 23 , 2013 . Retrieved July 23 , 2013 .

 World Population Growth ( Oct 2016 ) , Esteban Ortiz - Ospina and Max Roser , OurWorldInData.org

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Question: it took 130 years for the human population to double from 1 billion to 2 billion