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Transcript of Population Theories:
Measures global biodiversity
Biodiversity has declined by 33% since 1970
USA and China account for more than 2/5 of the planet's ecological footprint
According to the Living Planet Report we are creating an
"ecological credit crunch"
We are using 30% more resources than Earth can replace each year
This means we are using the natural resources that drive our economy to a point of
Ecological debt= $4-4.5 trillion dollars
Is population reaching its limit?
The Limits to Growth Model
A study done in 1970 follows the same growth model as Malthus
Determined 5 basic factors that determine and may limit population growth
2. Agricultural Production
3. Natural Resources
4. Industrial Production
Let's read about it
Turn to page 80
What does the Limits Growth Model say about the future of humans and population growth?
Do you agree/disagree?
Is it possible to change these growth trends and establish sustainability?
In 1798 Thomas Malthus produced his theory of population
He believed that there was a
Population = relative to food supply
If population went higher than the food supply there would be a decline in population
"War, famine and disease"
How many people can our planet hold?
To Do: Study figure 4.7 and answer the questions a,b,c