World population 4.1

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World population 4.1

  1. 1. Chapter 4 Section 1<br />World Population<br />
  2. 2. Current World Population: 7 billion<br />
  3. 3. Growth Rates<br />World pop is growing rapidly b/c birthrates<br />have not declined as fast as death rates.<br />
  4. 4. Death Rates<br />Are the number of deaths per year in 1,000 people.<br />Improved diet and health care have lowered the death rate in many industrialized nations.<br />
  5. 5. Death Rate<br />
  6. 6. Birthrate<br />Is the number of births for every 1,000 people.<br />In economically developing countries, the birthrate is high.<br />In wealthy industrialized countries, the birthrate is low.<br />
  7. 7. Birthrates<br />
  8. 8. Challenges to Population Growth<br />World food production has risen to meet the demands on every continent except Africa.<br />However, rapidly growing populations are facing shortages of freshwater, housing, and clothing.<br />
  9. 9. Negative population growth<br />In some countries, the death rate is higher than the birthrate.<br />Countries like this often recruit workers from other countries to supplement their workforce.<br />
  10. 10.
  11. 11. Population Density<br />The Earth’s people are not evenly distributed over available land.<br />Most live by freshwater sources and in temperate climates.<br />Population density measures the average number of people living on a square mile of land. <br />
  12. 12. Population Density Continued<br />Population density formula:<br />Population of a country<br />Total land area of a country<br />Canada: 8 ppl per sq. mi.<br />Bangladesh: 2,401 ppl per<br /> sq. mi.<br />Belgium and Niger both have a population of 10.3 mil. But, Belgium is smaller (872 ppl per sq. mi.) and Niger is larger (21 ppl per sq. mi.)<br />
  13. 13. Population Density<br />
  14. 14. Population Movement (migration)<br />More people are moving to urban areas looking for better jobs, education, and healthcare.<br />½ the world’s ppl live in urban areas.<br />Ppl also migrate from other countries for greater economic opportunities and political freedom.<br />

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