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Biology- Ch 22 People and the Biosphere

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zagiri
24 diapositives · 380 Views · Jul 19, 2014

This chapter explores the rapid increase in human population and its significant effects on the Earth’s ecosystems. As populations rise, demand for resources leads to extensive environmental degradation, including deforestation, pollution, and loss of biodiversity. Key points include the need for sustainable practices like reducing waste, promoting reforestation, and protecting endangered species. The importance of clean water and air and the impact of pollutants, such as non-biodegradable waste and acid rain, are highlighted. Urgent action and education are critical for preserving our environment.

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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!