Minnesotans For Sustainability©
Sustainable Society: A society that balances the environment, other life forms, and human interactions over an indefinite time period.
What About Population?
The Ecological Footprint Quiz only shows an individual's impact. To calculate the overall impact of our species on the biosphere, we need to add up the Ecological Footprints of the Earth's entire human population. Since the size of the biosphere is finite, the greater our world family, the less nature per person.
If people have, on average, more than 2 surviving children, the population will increase. That's the mathematics of population growth. In societies with a large per capita consumption, just maintaining current population size may not be compatible with sustainability if there is no significant reduction in the average Ecological Footprint. In other words, we must address both our population size and the size of our Footprints in order to keep our planetary use of natural resources in balance.
What would happen if the factors leading to population growth changed? Below is some simplified data for the mathematically inclined, illustrating how the number of children families have affects the global population.
a) One-child families. If families were to have on average one child each, the 2.9 billion "children" will have produced 1.5 billion offspring once they become parents by 2025. The generation of 1.5 billion will in return have 0.8 billion offspring by 2050. If the population would move back to 2-child families in 2100, the population would stabilize within about 50 years at 600 million people.
b) Two-child families: If the 2.9 billion people between 0 and 25 years were to reproduce at replacement fertility, all three age categories would eventually grow to 2.9 billion each. This would lead to a world population of 8.7 billion people by the year 2050.
c) Maintaining current growth rate. In 2001, the growth rate (birth rate minus death rate) of the world population was 1.3 percent per year. If this rate of growth were to remain constant into the future, there would be 22.2 billion people on Earth in the year 2100.
Data derived from: UN Population Division, http://esa.un.org/unpp,
"World Population Prospects" (World population database, 2000) and Population
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