The world population explosion is synonymous with a consumer explosion. Each person on the face of the planet consumes natural resources directly, as food (unless they are starving), and indirectly as processed or manufactured products (unless they are destitute).
Have you ever seen estimates of the world population in ancient times and wondered where they came from? Sources include reference books containing data collected by historians. The first chart on the right shows the upper and lower estimates from a variety of sources as compiled by the U.S. Census Bureau. The data is available online in tabular form: Historical Estimates of World Population. The second chart shows the population explosion since the industrial revolution got underway.
In the first chart there is a dip corresponding to the plague outbreak known as the Black Death. It first struck Europe in the mid-14th century, killing up to a third of the population. Around the same time there were plague epidemics across large swathes of Asia and the Middle East.
Before the period in which European countries began to keep parish records of births, deaths and marriages, any population estimates can be no more than informed guesses. There’s a listing of sources used in historical population assumptions on the website of the University of Tennessee at Knoxville: Population Data Sources. However, after the spread of the industrial revolution to developing countries, governments began to organize censuses which provide historians with increasingly accurate worldwide population data from the early 19th century onwards.
Just one lifetime ago, no person had ever lived through a doubling of the world population. Now some have lived through a tripling.
What’s the margin for error?
The margin for error in present day world population figures is less than 0·1% (6 million). Estimates of future population levels have a wider margin for error because birth rates may change.
Consuming the environment to death
“Collapse” is one of three bestselling books by Jared Diamond, Professor of Geography at University of California, Los Angeles (see “Jared Diamond’s Themes,” on this site). After an in-depth survey of societies that collapsed as a result of resource depletion, the final chapter addresses the question “What Does It All Mean to Us Today?”
The per-capita impact of individuals — the resources consumed and wastes put out by each person — varies greatly around the world. Low-impact inhabitants of Third World countries are fast becoming high-impact people because they see and covet First World lifestyles. Immigration from low-impact countries is the main driving force behind population increases in the United States and Europe. Jared Diamond quotes some alarming statistics:
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Even if the people of China alone achieved a First World living standard while everyone else’s living standard remained constant, that would double our human impact on the world.
According to Diamond, advocates of business-as-usual are contributing to the problems of environmental overload:
Jared Diamond wrote an OpEd for the New York Times in January 2008 — “What’s Your Consumption Factor?” There’s a copy of the article at:
He had this to say about global consumption at the U.S. level:
The consequences of overpopulation also seem to have gone unnoticed by religious groups opposed to family planning. They are inadvertently urging humanity towards an apocalyptic descent into chaos worse than the Biblical story of Adam & Eve’s expulsion from the Garden of Eden. If Satan exists, he must be delighted at how well he has deceived them.
More to read:
Collapse: How Societies Choose to Fail or Succeed.