Overpopulation

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Overpopulation

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(No Transcript)
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Estimates of Most Populous Countries in 2025
Ratio 20251950
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Regional Population Distribution for People Under
Age 15
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Fertility Rates USA
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The Demographics of Life
USA Source www.populationconnection.org/Communications/demfacts.PDF World
284.5 million Population, Mid 2001 6.1 billion
77 Population per square mile 118
15 Births per 1,000 people 22
9 Deaths per 1,000 people 9
2.1 Total fertility rate 2.8
21 of pop under age 15 30
13 of pop over age 65 7
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The Demographics of Life
USA World
49 Births per 1,000 women aged 15-19 50
7.1 Infant deaths per 1,000 live births 56
29,240 GNP per capita (PPP) 6,300
995 kCal Avg daily per capita calories from animal products 441 kCal
66 Grains fed to livestock as total grain consumption 3
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The Demographics of Life
USA World
19,674 kg Annual per capita carbon emissions 4,157 kg
5 energy consumption from renewable sources 14
1 female labor force in agriculture 52
4 male labor force in agriculture 46
1,484 Tractor per 1,000 agricultural workers 20
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Estimates of Most Populous Countries in 2025
Ratio 20251950
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World Population
While demographic transition is occurring in many
places, the world population keeps increasing at
a rate of about 1.5 to 2 per year.
So the doubling rate is between 35 and 46 years!
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World Population Growth
What will this mean for the planet? Will we
alter the human carrying capacity by our impact?
What can we do to help stabilize the worlds
population? What should we do?
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Consumption Comparisons
One quarter of the global population living in
developed countries consumes for 80 of the
worlds total energy. USA alone accounts for 6
of the global population , but consumes 30 of
its resources. 20 of the global population
consumes 70 of its material resources and
possesses 80 of the wealth. The majority of
this 20 in centered in Canada, USA, Saudi
Arabia, Australia, and Japan.
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Consumption Comparisons
A child born today in the United States will by
the age of 75 years produce 52 tons of garbage,
consume 10 million gallons of water and use 5
times the energy of a child born in the
developing world. The United States uses
approximately one quarter of the world's fossil
fuels and is the largest contributor of carbon
dioxide, undesirable combustion products, and
chlorofluorocarbons, chemicals that contribute to
greenhouse warming and attack the Earth's ozone
shield.
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Consumption Comparisons
Increasing the fuel mileage of cars by just 3
mpg would save the same amount of oil that could
be tapped from the Arctic National Wildlife
Refuge over 10 years. Every 20 minutes, the
world adds another 3,500 human lives but loses
one or more entire species of animal or plant
life - at least 27,000 species per year.
Population is growing faster than food supplies
in 64 of 105 developing countries.
Overcultivation, primarily due to population
pressures, has degraded some 2 billion hectares
of arable land - an area the size of Canada and
the United States combined
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Globally, the demand for fresh water exceeds the
supply by 17 percent already. Two-thirds of the
world's population will experience some form of a
severe water shortage in the next 25 years.By
2025, when world population is projected to reach
8 billion, 48 countries with a total population
of 3 billion will face chronic water shortages.
In 25 years, humankind could be using over 90
percent of all available freshwater, leaving just
10 percent for the rest of the world's plants and
animals.
Consumption Comparisons
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What is the Carry Capacity of the Planet for
Humans?
Paul Erlich Population Bomb, 1968 predicted 2
billion. Now at 6 billion. Julian Simon there
is no problem, more people means more potential
technology solutions. Some estimate 20 billion
will be maximum (at this rate, in your
lifetime!!!) Solution balance of population
controls and consumption controls.
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What Should We Do?