Populations

OVER 7 BILLION PEOPLE!

Exponential growth Global population 10 billion by 2050 Level off? Between 1000ad and 1800ad = slow growth 1800 – 1950 global population doubled It doubled again between 1950 and 2000

Demography The study of populations Birthrate Death rate Use statistics to measure/learn from population growth Birthrate Death rate Natural increase

Demographics Transition Model Sequence of demographic changes where a country moves from high birth/death rates to low birth/death rates in five stages Stage 1 Stage 2 Stage 3 Stage 4 Stage 5 Low Growth High birthrate and high death rate High Growth Decrease in the death rate Moderate Growth Decrease in the birthrate Low birthrate and low death rate Zero or Negative Growth Population neither grows nor shrinks

Demographics Transition Model

DTM first used in industrialized Western Europe Abundant / reliable food sources Improved healthcare Access to medicine and technology Higher standard of living: Quality and quantity of goods/services available and the way they are distributed within a population

Population pyramids

Negative growth rate Higher death rate than birthrate Labor shortages Migrant labor “host Population” vs. Migrant communities

Population distribution Variations in population that occur across a country, a continent, or the world Where do people live and why do they live there? Most of the population lives on 30% of the land Mountains, tundra, deserts Europe and Asia are most densely populated Most people in Europe, Australia, and the western hemisphere live in or around urban areas

Population Density The average # of people living on a square mile or Kilometer of land Divide the total population by the total land area The higher the average, the higher the density Does not account for uneven population density Total land area includes uninhabitable zones Egypt – 232 people per sq. Mile OR 7,501 people per sq. Mile if you use only the inhabitable land area