World Population Chapter 4 Section 1 World Population

World Population Chapter 4 Section 1

World Population l l 6. 5 Billion People on Earth That’s 6, 500, 000!!!! Estimates are there will be 9 Billion by 2050 Doubling time: the number of years it takes for a population to double in size. – – In the US it’s around 300 years In some parts of Asia, Africa and Latin America it’s only 25 years!

WHAT DOES THIS MEAN? How does a rapidly expanding population harm poorer nations?

How indeed? l l More people need more food. More people use more resources. More people leads to more pollution. More people need more space.

The Demographic Transition l l Uses birth rates and death rates to show changes in the population trends of a country or region. Look at page 71 in text book

Demographic Transition Model

Definitions: l l Birthrate: The number of births every year per 1000 people. Death rate: The number of deaths per year per 1000 people. Natural Increase: (Growth Rate) the difference between birthrate and death rate. Migration: Movement of people from place to place

Does population always increase? l l l Current trend is for population increase Negative change occurs when death rates exceeds birthrates per year This often causes a reliance on foreign labor and immigration.

Population Density l l l Let’s look at the map on page 73 What areas are the most heavily populated? Which areas of the Northern Hemisphere are most densely populated? Why? Population density: The number of people living on a square mile or square kilometer of land.

Our Urbanizing World l l The human population is rapidly becoming more and more urban. 50% of the world’s people live in cities

Guided Reading Activity 4 -1