Human Population Growth

Mrs. Sandy Gomez

Human Population Growth

• Human population has been growing almost exponentially for almost three centuries

• No other population of large organisms has shown such growth for so long

Human Population Growth

• But no population can grow indefinitely

• Human population must eventually either level off or decline

Human Population Growth

• This reduction in population growth will occur because of decreased birth rates or massive mortality

Human Population Growth

• Demographic Transition:

Refers to the transition from high birth and death rates to low birth and death rates.

Human Population Growth

High Birth Rates

High Death Rates

Population

Stabilizes

Human Population Growth

Low Birth Rates

Low Death Rates

Population

Stabilizes

Human Population Growth

High Birth Rates

Low Death Rates

Population

Increases

Human Population Growth

Low Birth Rates

High Death Rates

Population

Decreases

Human Population Growth• Age Structure Pyramid• Also called an age picture diagram• Is a graphical illustration that shows the distribution of

various age groups in a population

Human Population Growth• Types of Age Structure Pyramids• Stable pyramid• Stationary pyramid• Expansive pyramid• Constrictive pyramid

Human Population Growth

• Expansive pyramid • A population pyramid that is very wide at the base, indicating high birth and death rates.

Human Population Growth

Human Population Growth

• Stationary pyramid • A population pyramid typical of countries with low fertility and low mortality, very similar to a constrictive pyramid.

Human Population Growth

• Constrictive pyramid • A population pyramid that comes in at the bottom. 

Human Population Growth

Thanks for your attention!