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Biology- Ch 22 People and the Biosphere

Biology- Ch 22 People and the Biosphere

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Biology- Ch 22 People and the Biosphere

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  1. Biology- Ch 22People and the Biosphere

  2. Human Population • Rapid increase in human population leads to: • Great demands on Earth • Population grows when- _____ rate is higher than ______rate

  3. Human Population…Effects

  4. Human Population- Effects • Lack of ____in some countries • Forests & moutains being ruined for _______ • Destruction of tropical forests Add:

  5. Pollution • We need to: • Produce fewer _____ • Clean up wastes we produce • May have to live w/less ________growth

  6. Pollution • __________-can be broken down by microrganisms- into the nutrients they were made from • Examples: sewage, scraps of food, certain paper items

  7. Pollution • Nonbiodegradable- cannot be broken down by ______processes- or is done very slowly • Examples: glass, certain plastics, metals, radioactive wastes, DDT, pesticides, etc…

  8. Biological ___________ • Primary producers pick up non-bio. pollutants from water • Concentrate & stored in tissues • Herbivores eat producers • Carnivores eat herbivores • ___________further- dangerous!

  9. Air Pollution • Invisible • _____- smoke & fog • Differences in LA & Midwest • Acid Rain • Pollutants combine w/H2O vapor • Effects felt in many ways

  10. Air Pollution

  11. Air Pollution continued • _________effect • CO2 in air from burning of wood & ________ • CO2 absorbs heat energy & traps it in to the biosphere • “Heat _______”

  12. Air Pollution

  13. Water Pollution

  14. Water Importance • 75% of Earth = WATER • ___fresh, 97% salty/ocean • Only small amount of 3% is usable

  15. Water Pollution

  16. Water Pollution • Chemical wastes • Raw sewage • ________pollution- heated H2O from factories released into aquatic environments • Oil spills • Ocean Acidification

  17. Water Pollution

  18. Fate of the Earth • Reforestation • Planting new trees when old ones cut down, speeds up What? _____ • ___________Species • Many getting dangerously close to extinction

  19. Reforestation

  20. What can We DO? • Government- special lands set aside for conservation • Certain groups protect single species • Education- some products may cost more- it is worth it!

  21. Recycling!People need to do it for it to work!