• Reference
  • Advanced
  • General

Population Math - General

 Population Math Video

Watch our illustrated Population Math video on Youtube

 

It is necessary to understand the concept of exponential growth when dealing with the question of population.

If a small tribe of 100 people finds a rich resource base and grows at the rate of 2% annually, it adds 2 people in the first year.

  • The next year, since its population is now 102, it adds 2.04 people.
  • By the 10th year, its population is 124 and adding 2.4 people per year.
  • At year 100, there are over 600 tribe members with 12 more on the way.
  • By year 500, the society boasts 2 million citizens increasing by 40,000 annually.

Will the resource base which was so abundant with a small population support a much larger and rapidly growing population?

By year 1000, the population has grown to 40 billion. But clearly, in earth's history, populations will grow rapidly in favourable conditions but in doing so quickly outstrip and degrade their resource base. The result is a population collapse. Hence the term "population cycle".

This is why, although there are many examples of rapid population growth through history, the human population growth rate has averaged less than 1/10th of 1% over the past 100,000 years.

The example at the other end of the spectrum shows how unrealistic the concept of infinite growth is. If our tribe had grown at 6% annually, a rate which has been documented for short periods in history, it would have numbered 2 billion billion billion after 1000 years. And it would shortly be growing as a sphere of humanity expanding outward at the speed of light.

Infinite population growth, at any rate, is not possible for any tribe, city or nation as it assures resource exhaustion, collapse and disaster.

Population Math - Advanced

 

Population Math - Reference

Subject MatterSource

The International Data Base (IDB) offers a variety of demographic indicators for countries and areas of the world with a population of 5,000 or more.
Read More
US Government

A compilation of statements made over the years by a diverse assemblage of scientists and environmentalists, philosophers and philanthropists and other thinkers. Though they disagree on many other matters, they all recognize human overpopulation as one of the greatest threats to humanity and to the natural world.
Read more
Scientists and Environmentalists for Population Stabilization

Year-by-Year World Population Estimates: 10,000 B.C. to 2007 A.D.
Read More
ScottManning

David Suzuki Says Canada Is Full - No More Immigrants!
Read More
Zimbio

Global Population Statistics and projections
Read More
GeoHive

Population Key Terms and Definitions
Read More
Population Terms

Our mission is to improve understanding within the U.S. scientific, educational and environmental communities of the fact of overpopulation and its social, economic and environmental consequences at both national and global levels.
Read more
populationstabilization.org

A simple way to explain overshoot is analogizing Earth?s resources and ecosystems to your savings account at the bank - See more at: http://www.growthbusters.org/2013/07/your-prediction-of-earth-overshoot-day/#sthash.CdxzFsdR.dpuf
Read More
GrowthBusters

Population stats and population clock
Read more
Population Reference Bureau

There is a good reason why one might expect Egypt to start running into problems with energy and food subsidies.
Read More
Our Finite World

The Biggest Population Boom in (recorded) History
Read more
Matter

Glossary of Demographic Terms
Read More
Population Reference Bureau

Population and energy Watch this important and engaging presentation broken into ten-minute segments, below.
Read more
Albert A. Bartlett

Ethiopia Population growth rate
Read More
Index Mundi

Population Match calculations
Read more
Albert A. Bartlett
Motion Graph: Population Math
Impact Index

Population Math

Net Immigration Increase Impact

0.7%
Population Math
  • Net Immigration Increase 0.7%
  • Birth Rate 1.1%
  • Death Rate 0.7%
  • Immigration 0.8%
  • Emigration 0.1%
  • Natural Increase 0.4%


Population Math - The figures above are for Canada in 2015.

How To Use the Website