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Human population

Explore the causes and effects of human population growth on the environment, such as pollution, resource depletion, and habitat loss. Learn about practical solutions like zero population growth, conservation efforts, and sustainable practices to mitigate these challenges and ensure a healthier future for all. Reflect on the importance of reducing consumption and implementing the three Rs - reduce, reuse, recycle - to lessen the ecological footprint of developed countries. Test your knowledge on the reasons for population growth, its link to pollution, and strategies for minimizing its impact through sustainable actions.

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Human population

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  1. Population Growth Human population Why is human population growth an environmental problem?

  2. Fill It In … • Sketch a graph of human population growth: Industrial Revolution

  3. Causes of human population growth • Agricultural Revolution • People settle into communities and more people were needed for division of labor • More reliable food supply can support a larger population

  4. Causes of human population growth • Industrial Revolution • In the early 20th century technological advancements led to improvements in medicine and sanitation, allowing for an increased birth rate and decreased death rate.

  5. Causes of human population growth • Urbanization (development of cities) leads to economic and social development which influence human populations.

  6. Effects of human population • Increased pollution - air, water, and land • ALL pollution problems relate back to overpopulation. • Pollutants are produced as waste products from human activities, such as burning fossil fuels, mining, and use of consumer goods.

  7. Effects of human population • Solid waste requires disposal in landfills or incineration.

  8. Effects of human population • Decreasednatural resources, especially nonrenewable resources (available only in limited amounts) • Ex. fossil fuels, minerals, metals

  9. Effects of human population • Increased land use - leads to loss of habitat for other species.

  10. Census data • Demographers construct histograms to use in predicting future population growth trends field called “demography” Developing & Developed & Developed & Growing Stable Decreasing

  11. Fill It In … Draw the three basic shapes: Increasing - Stable - Decreasing -

  12. Solution • ZPG - zero population growth (birth rate = death rate) • Limit number of births per family by offering tax incentives • Ex. China • Make birth control and family planning more available • Educate public and our political leaders =

  13. Solution • Conservation - wise and careful use of resources through environmental stewardship • Twenty percent of the world’s population uses more than fifty percent of the world’s resources.

  14. Solution • People in developed countries (like the U.S.) can decrease resource use by the 3 R’s: • Reduce - use less materials; for example, buying products that have less packaging • Reuse - use products more than once; for example, bring lunch in Tupperware instead of one-use containers • Recycle - return products to be re-processed; for example, old tires are used to make track surfaces

  15. Solution • Sustainability ensuring the availability of resources and a stable environment for future generations

  16. Fill It In … Give an example of one human action that is NOT sustainable:

  17. Check Yourself! • What were three causes of human population growth? • Why does human population growth lead to increased pollution? • How do people, particularly those in developed countries, need to lessen the impact of human population growth? • Why is the pyramid-shaped histogram characteristic of a growing population?

  18. Check Yourself! • What were three causes of human population growth? AGRICULTURAL REVOLUTION, INDUSTRIAL REVOLUTION, & URBANIZATION • Why does human population growth lead to increased pollution? • How do people, particularly those in developed countries, need to lessen the impact of human population growth? • Why is the pyramid-shaped histogram characteristic of a growing population?

  19. Check Yourself! • What were three causes of human population growth? AGRICULTURAL REVOLUTION, INDUSTRIAL REVOLUTION, & URBANIZATION • Why does human population growth lead to increased pollution? POLLUTANTS ARE PRODUCED AS WASTE PRODUCTS FROM HUMAN ACTIVITIES • How do people, particularly those in developed countries, need to lessen the impact of human population growth? • Why is the pyramid-shaped histogram characteristic of a growing population?

  20. Check Yourself! • What were three causes of human population growth? AGRICULTURAL REVOLUTION, INDUSTRIAL REVOLUTION, & URBANIZATION • Why does human population growth lead to increased pollution? POLLUTANTS ARE PRODUCED AS WASTE PRODUCTS FROM HUMAN ACTIVITIES • How do people, particularly those in developed countries, need to lessen the impact of human population growth? USE THE THREE R’S AND SUSTAINABLE ACTIONS • Why is the pyramid-shaped histogram characteristic of a growing population?

  21. Check Yourself! • What were three causes of human population growth? AGRICULTURAL REVOLUTION, INDUSTRIAL REVOLUTION, & URBANIZATION • Why does human population growth lead to increased pollution? POLLUTANTS ARE PRODUCED AS WASTE PRODUCTS FROM HUMAN ACTIVITIES • How do people, particularly those in developed countries, need to lessen the impact of human population growth? USE THE THREE R’S AND SUSTAINABLE ACTIONS • Why is the pyramid-shaped histogram characteristic of a growing population? BIRTH RATE IS HIGHER THAN DEATH RATE (BOTTOM IS BIGGER THAN TOP)

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