16.1 Human population growth and natural resources.ppt

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1. 16.1 Human Population Growth And Natural
Resources
KEY CONCEPT
As the human population grows, the demand for
Earth’s resources increases.
What happened to this forest?

2. 16.1 Human Population Growth And Natural
Resources
Earth’s human population continues to grow.
6,000,000,000
•Earth’s human carrying capacity is unknown.
•English Economist
•Said that the
human population
is growing faster
than the Earth’s
resources can
support
–This will result
in famine,
disease, war,
etc.
Thomas
Malthus

3. 16.1 Human Population Growth And Natural
Resources
•Technology has helped to increase Earth’s carrying
capacity.
–gas-powered farm equipment
–medical advancements such as antibiotics
1940 40 infant deaths/1000 births
2002 7 /1000
Make a list of the technologies you used today.

4. 16.1 Human Population Growth And Natural
Resources
Technology I Used Today
•Lap Top
•Coffee Maker
•Running Water
•Refrigerator
•Cell Phone
•Toilet
•Microwave
•Car
•Radio
•Lights
•Furnace
•Television
•Garage opener

5. 16.1 Human Population Growth And Natural
Resources
The growing human population exerts pressure on
Earth’s natural resources.
•Nonrenewable resources are used faster than they form.
–coal
–Oil
–Natural Gas
•Growing use of this resource will
eventually lead to an energy crisis
•Fun fact: In 2006, humans were using
oil at a rate of about 77 million barrels
per day.

6. 16.1 Human Population Growth And Natural
Resources
•Renewable resources cannot be used up or can replenish
themselves over time.
–wind
–water
–sunlight
•Growing use of
nonrenewable
resources may
lead to a crisis.
•Resources must
be properly
managed.
Explain how a renewable resource like water
can become nonrenewable.

7. 16.1 Human Population Growth And Natural
Resources
Drinking Water – As Renewable Resource
•Pollution and overuse threaten its
supply
–Pesticides
–Industrial waste
–Other contaminants
•In 1900, 25,000 American’s died
of typhoid. By 1960, thanks to the
use of chlorine in water treatment,
that number dropped to 20.
Found in water
sources that
supply tens of
millions of
people across the
country

8. 16.1 Human Population Growth And Natural
Resources
As human population grows…
•Fun Fact: United States
uses more resources and
produces more waste than
any country on Earth
•Fun Fact: U.S. generates
about 230 millions tons of
garbage
–4.2 pounds per day, per
person, or almost 1 ton
per year

9. 16.1 Human Population Growth And Natural
Resources
Effective management of Earth’s resources will help meet
the needs of the future.
•Earth’s resources must be used responsibly.
•Careless use of resources makes them unavailable to
future generations.
•Sustainable Use
–Crop rotation
–Aquaculture
–Alternative pest control
•Easter Island is
an example of
irresponsible
resource use.

10. 16.1 Human Population Growth And Natural
Resources
•An ecological footprint is the amount of land needed to
support a person.
•The land must produce and maintain enough
–food and water
–shelter
–energy
–waste
Average American
citizen’s ecological
footprint covers an
area large than 24
football fields.
Largest in the world.

11. 16.1 Human Population Growth And Natural
Resources
•Several factors affect the size of the ecological footprint.
–amount and efficiency of resource use
–amount and toxicity of waste produced