Human Population

Annual growth rate Birth Rate – Death rate

Doubling time 70/rate

Annual growth rate 1804 - 1927 1927 – 1959 1959- 1974 1974-1987 1987-1999 1999-2011

Most of human history was in a state of dynamic equilibrium.

Human Pop. Growth Over Time Why the sudden increase?

Deaths declined Medical advancesVaccines: 1730 Cell Theory: 1870Penicillin: 1928

Opposing social viewpoints THOMAS

MALTHUS

Reproduce faster than food is produced

Overpopulation

Depletion of natural resources, unemployment

Increase Environmental Resistance

A Modest Proposal

KARL MARX

Unequal distribution of wealth

Poverty

Overpopulation

Take from the rich and give to the poor

Communist Manifesto

Human condition

Results

Which causes

Solution

Does population growth cause harm?

YES

It puts a burden on our finite resources

1.2 billion do not have safe water to drink

Greater resource demand

Larger cities

More pollution

Greater chance of diseases spreading

.

NO

Overconsumption is the issue

For ever mouth, there are a pair of hands and that will find a solution for their needs.

Opportunity for human prosperity

Economic , technological growth

….

Future population predictions

World population growth rate peaked in 1960’s, then began to decrease

Demographers ask is there “overpopulation”?

Population Density versus Population Cultural Carrying Capacity (I = P*T*A)

We can fit into TX. World's population 7,000,000,000. The landmass of Texas

7,500,000,000,000 sq. ft. How many square feet does each person

get? How much of an acre (43,560 sq.

ft./acre)?

Demographers ask, Is there overpopulation? Which causes more harm to the

environment, high population growth rates or

overconsumption ?

Different growth rates = Different problems

Rapid growth▪ Migration to cities. Increases poverty, crime,

disease▪ Money is diverted from education, infrastructure

Negative growth▪ Graying population▪ Economic declines

Population Pyramids:

What is the “correct”growth rate?

Fertility rates 1.0, 2.1, or 6.o

What decides? Religion Economy Government Carrying capacity

How to achieve the correct growth rate Policy

Focus on population size Focus on social justice

Government Equal rights, empower women India: forced sterilizations

Religious Pres. Bush eliminated funding for Planned

Parenthood Economics

Demographics transition

Achieving the correct growth rate

Demographic transition