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Human Activities Honors Biology Mr. Lee Room 320

Human Activities Honors Biology Mr. Lee Room 320. Objectives. Describe human activities that can affect the biosphere. Human Activity. Human activity can affect the biosphere Human activities that affect the biosphere are: Hunting and gathering Agriculture Industry Urban development.

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Human Activities Honors Biology Mr. Lee Room 320

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  1. Human ActivitiesHonors BiologyMr. LeeRoom 320

  2. Objectives • Describe human activities that can affect the biosphere

  3. Human Activity • Human activity can affect the biosphere • Human activities that affect the biosphere are: • Hunting and gathering • Agriculture • Industry • Urban development

  4. Hunting and Gathering • This is how humans obtained food for most of our history • Some scientist believe that the first humans to arrive in North America caused mass extinctions

  5. Hunting and Gathering… • Modern subsistence hunters waste little of their catch & make few demands on the environment • Poachers can kill animals till extinction

  6. Agriculture • About 11 thousands years ago humans started the practice of farming (agriculture) • Agriculture includes growing of plants and raising animals • Traditional agriculture uses simpler tools & animal-drawn vehicles • Modern agriculture uses large-scale irrigation, & mechanical farm tools

  7. Agriculture… • With the predictable food supply from agriculture, humans were able to have larger settlements • The “Green Revolution” began in the 1950’s • New farm techniques that increased food production • Often leads to soil erosion and large demands on water supplies

  8. Industrial Growth • The industrial revolution had a large impact on the biosphere • Most of our energy comes from fossil fuels • Some types of industrial processes pollute the air, water, and soil

  9. Urban Development • Dense human communities produce large amounts of wastes that need to be disposed of • Suburban sprawl takes away farmland and puts additional stress on plants and animals (food webs)

  10. Review • Describe human activities that can affect the biosphere: • Hunting and gathering • Agriculture • Industry • Urban development

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