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A Growing Population

A Growing Population. 6.1. World Population. The total number of people on Earth More than 6.4 billion By the year 2050, the world population could be more than 9 billion Meeting the needs of all these people has a huge impact on Earth’s natural environment. Growth Rates.

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A Growing Population

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  1. A Growing Population 6.1

  2. World Population • The total number of people on Earth • More than 6.4 billion • By the year 2050, the world population could be more than 9 billion • Meeting the needs of all these people has a huge impact on Earth’s natural environment

  3. Growth Rates • The world population grows by about 85 million people each year • 233,000 people are added each day (about 10,000 per hour, 3 per second) • The growth rate is how quickly a population increases or decreases

  4. Adding to population • People are added through births • People are subtracted through deaths • People can be added/subtracted through migration • A large movement of people from one place to another

  5. Exponential Growth • Read page 217 • Persian Legend pg 218 • Carrying capacity – The largest number of living things that an area can support • Earth’s estimated carrying capacity is 7.7-12 billion people

  6. Understanding Numbers • Population growth is tied to two factors – Birth rates and death rates • Problems such as food shortages and diseases increase death rates • Death rates are the numbers of deaths in one year per 1,000 people

  7. Numbers cont. • Medical discoveries and technologies increase birth rates • Birth rates are the number of births in one year per 1,000 people

  8. Early Life • Early hunter-gatherer population numbers were quite small due to the challenges of finding food and staying alive • Population did not increase until the Agricultural Revolution • Food was easier to obtain, people lived longer and produced more children

  9. Population grows • Another jump in the population was due to the Industrial Revolution • Improvements in medicine and food production made people less likely to die from sickness and hunger • Death rates decreased and birth rates increased • This pattern continued for many years

  10. Recent Decrease in Population • The world’s growth rate has slowed some in the last 40-60 years • Women in many parts of the world are choosing to have fewer/no kids • Diseases such as AIDS are increasing death rates in many areas

  11. Vocabulary • World Population • Growth Rate • Migration • Carrying Capacity • Death Rate • Birth Rate

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