1. KNOWING WHEN TO SAY WHEN…
OVERPOPULATION
KNOWING WHEN
TO SAY WHEN…

2. THOMAS MALTHUS
( )
An English economist who argued that the world’s rate of population increase was outrunning development food supplies. His claim was that population increases geometrically but food supply increases arithmetically. He predicted that population growth would outstrip food resources unless “moral restraint” lowered CBRs or disease, famine, war or other disasters raised CDRs. The point of crisis is when an area exceeds its CARRYING CAPACITY (the maximum number of a species that an environment can sustain indefinitely)

3. –Dr. Susan Blackmore, nueroscientist
NEOMALTHUSIANS
Claim Malthus’s prediction is more pressing that ever because:
He failed to predict the medical revolution and its ushering LDCs into stage 2, thus the gap between population and resources is wider in some countries than Malthus anticipated
World population is outstripping other resources, not just food:
Water
Energy
Farmland
Clean Air
The prediction: increased wars and violence in the future.
“The fundamental problem [facing the planet today is that] there are too many people. For the planet’s sake, I hope we have bird flu or some other thing that will reduce the population, because otherwise we’re doomed.”
–Dr. Susan Blackmore, nueroscientist

4. ANTI- MALTHUSIANS Claim that Malthus was a moron
Claim that the world’s resources are not fixed but expanding
Are possibilists and claim that humans can choose positive courses of action to expand food supply and other resources
Man can develop new technologies, use existing resources more efficiently and substitute new resources for scarce ones
Boserup and Kuznets: larger population is good… stimulates the economy and leads to more food production. More population, more customers and more thinkers/inventors.
Julian Simon: Yeah, what they said.
Marxists: the problem isn’t production/population, the problem is distribution (unfair society)
Various leaders: more population is good because greater numbers = greater power.

5. REALITY
World as a whole has plenty of food, but some areas do face shortages
Malthus was pretty accurate about food production and its arithmetic growth
However production has grown faster than anticipated recently due to better growing techniques, high yield seeds, expansion of cultivated land, fertilizer technology, etc.
And food production has grown has outpaced NIR since 1950
Population did not quadruple between 1950 and 2000 as Malthus expected because cultural, technological and economic changes pushed more countries into stages 3 and 4 of the DT faster than he predicted
Population has been growing at a slower pace since the 1970s (down to 1.3 from 1.8 for the world)
The question is WHY? ?

6. MALTHUS IS STILL RELEVANT
AMMUNITION
FOR BOTH
SIDES
MALTHUS IS STILL RELEVANT
MALTHUS IS IRRELEVANT
THE EVIDENCE
THE EVIDENCE
A. The population is rising/ has grown as Malthus predicted
A. Pop growth not geometric/ or as Malthus predicted
B. Food supply has increased, but it has not kept up with population increase or has grown as predicted by Malthus.
B. Food supply has grown faster than Malthus predicted / the carrying capacity of most country’s land has increased
C. There are other limiting factors on population in addition to food.
C. Better modern ability to preserve food and/or distribute food to areas of need
THE REASONS
THE REASONS
A. Limited use of contraception. Political policies, economic decisions, cultural beliefs that support population growth. Country is in Stage 2 and/or early Stage 3 of the Demographic Transition.
A. Expanded use of contraception. Countries have political policies, economic decisions, cultural beliefs that limit population growth. Countiry is in late Stages 3, 4, and/or 5 (declining birth rate) of the Demographic Transiition.
B. Countries: fail to adopt agricultural innovation, b/c political policies, economic decisions, cultural beliefs. Convert farmland for urban use. Have practices that create environmental degradation (desertification, overgrazing, clear cutting, soil erosion, waterpollution). Convert of food crops to cash crops. Have high fuel prices that slow growth of food production and distribution.
B. Countries have: efficient farming (industrial tech). Green revolution techniques. Expanded Agricultural land. Humans with the ability to problem solve
C. Improvements in methods of transportation. Improvements in food preservation
C. Because of resource overuse and/or environmental degradation, countries exceed their carrying capacity

7. DECLINING NIR The NIR can decline for only two reasons:
A HIGHER death rate (CDR)
A LOWER birth rate (CBR)
Which is a bad choice…
In movies and in reality
Which is what is happening…
except for a few countries in Africa

8. LOWERING THE CBR Economic Development Approach (Pro-Natal)
Family Planning Approach (Anti-Natal)
Pro-natalism assigns a positive value to birth and espouses its free practice. This approach allows families free choice while also creating an environment where couples choose to have fewer babies.
Emphasizes reliance on economic development to push the social changes of stage 3
Wealthier communities have more to spend on health care, sanitation, education and programs that end up lowering the CBR
If more women are in school and attend school longer, and if more women pursue careers, then they delay having children and have fewer children
If more people are urban centered and work in industry, they have fewer children
With improved health care and sanitation, IMR’s drop and since more infants survive, women have fewer children
Anti-Natalism assigns a negative value to childbirth when childbirth contributes to overpopulation. There are more and less aggressive methods.
On the whole these methods seek to bring advances of the medical revolution, primarily birth control, to LDCs to lower CBRs in them.
Less Aggressive Method: Voluntary family planning through distribution of birth control. Great success in Bangladesh (went from 6% to 58% usage in 25 years), Colombia, Morocco, Thailand.
75% of women in Asia and 66% in Latin America employ birth control, only 25% Africa.
More Aggressive Methods:
China’s One Child Policy
Forced Sterilization (Nazi Germany)

9. HIGHER CDR
Lower CBRs have reduced the NIR in most places, but some Sub-Saharan African countries have seen higher CDRs.
The CDR usually grows through the spread of disease.

10. SPREAD OF
INFECTIOUS
DISEASE

11. EPIDEMIOLOGIC TRANSITION The Demographic Transition
A model that identifies the distinct causes of death in each stage of the demographic transition
The Demographic Transition
Stage 1
Stage 2
Stage 3
Stage 4
CBR is high, variable
CDR is high, variable
NIR in flux near zero
Population flat, low
CBR is high, variable
CDR drops steeply
NIR increases steeply
Population explodes
CBR drops steadily
CDR shallows drop
NIR drops steeply
Pop increase shallow
CBR & CDR meet low and level
NIR near zero
Population flat, high
The Epidemiologic Transition
Stage of pestilence and famine
Stage of receding pandemics
Stage of degenerative and human created diseases
Stage of delayed degenerative disease
Infectious and parasitic diseases cause death
Malthus’s natural checks
Improved sanitation, nutrition, medicine in MDCs
Medical Revolution in LDCs
Degenerative diseases linger
Medical technology extends lifespan overall
Decrease infectious disease death
More age illnesses: cancer, heart disease

12. POSSIBLE
STAGE 5
Demographic Transition
Epidemiologic Transition
Stage 5
Stage of reemergence of infectious and parasitic diseases
CBR drops below CBR and begins period of irreversible population decline
Some diseases reemerge and other new ones appear, the CDR begins to rise
Caused by evolution, poverty, improved spread through travel

13. WORLD CANCER RATES 1. PREDICT THE RATES 2. PREDICT THE RATES
Some of the below cancers would be considered stage 2, others stage three and four. Try to predict their regions based on their descriptions
WORLD CANCER RATES
Where is cancer deadliest?
The answer depends on regional differences in lifestyle, diet, and health care. Worldwide, lung cancer claims the most lives.
Regional Patterns
Breast cancer rates are higher in richer nations, where women give birth later in life and have fewer children.
Colorectal cancer, linked to diets with more meat and processed foods in affluent nations, is less deadly when caught early.
Cervical cancer kills more women in countries where the human papilloma virus is common and screening rare.
Liver cancer is linked to the hepatitis B and C viruses, more prevalent in nations like China, South Korea, and Mongolia.
GRAPHIC: OLIVER UBERTI, NGM STAFF; SOURCE: GLOBOCAN, INTERNATIONAL AGENCY FOR RESEARCH ON CANCER
1. PREDICT THE RATES
2. PREDICT THE RATES
3. PREDICT THE RATES
4. PREDICT THE RATES