World Population Chapter 4 Section 1

World Population 6.5 Billion People on Earth That’s 6,500,000,000!!!! 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!

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

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

The Demographic Transition 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: 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? 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 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 The human population is rapidly becoming more and more urban. 50% of the world’s people live in cities

Guided Reading Activity 4-1