Managing Earth's Resources for a Growing Population

1. KEY CONCEPT As the human population grows, the demand for Earth’s resources increases.

2. Objectives • Summarize the current state and effects of human population growth • Explain the importance of effective resource management

3. Vocabulary • Nonrenewable resource • Renewable resource • Ecological footprint

4. Earth’s human population continues to grow. • Earth’s human carrying capacity is unknown.

5. Technology has helped to increase Earth’s carrying capacity. • gas-powered farm equipment • medical advancements

6. The growing human population exerts pressure on Earth’s natural resources. • Nonrenewable resources are used faster than they form. • coal • oil

7. Renewable resources cannot be used up or can replenish themselves over time. • wind • water • sunlight • Growing use of nonrenewable resources may lead to a crisis. • Resources must be properly managed.

8. An ecological footprint is the amount of land needed to support a person. • The land must produce and maintain enough • food and water • shelter • energy • waste

9. amount and efficiency of resource use • amount and toxicity of waste produced • Several factors affect the size of the ecological footprint.

10. Give 3 examples of how technology has influenced human population growth

11. What is the difference between renewable and nonrenewable resources Renewable Resources Nonrenewable Resources

12. What factors can limit the growth of the human population?

13. 16.2 Air Quality KEY CONCEPT Fossil fuel emissions affect the biosphere.

14. 16.2 Air Quality Objective • Describe the sources, types, and effects of pollution • Explain how air pollution contributes to acid rain

15. Vocabulary • Pollution • Smog • Particulate • Acid rain • Greenhouse effect • Global warming

16. 16.2 Air Quality Pollutants accumulate in the air. • Pollution is any undesirable factor added to the air, water, or soil. • Smog is one type of air pollution. • sunlight interacts with pollutants in the air • pollutants produced by fossil fuel emissions • made of particulates and ground-level ozone

17. 16.2 Air Quality • Acid rain is caused by fossil fuel emissions. • produced when pollutants in the water cycle cause rain pH to drop • can lower the pH of a lake or stream • can harm trees • Smog can be harmful to human health.

18. 16.2 Air Quality Air pollution is changing Earth’s biosphere. • The levels of atmospheric carbon dioxide rise and fall over time. • High levels of carbon dioxide are typical of Earth’s warmer periods.

19. 16.2 Air Quality carbon dioxide(CO2) methane (CH4) water (H2O) • The greenhouse effect slows the release of energy from Earth’s atmosphere. • sunlight penetrates Earth’s atmosphere • energy is absorbed and reradiated as heat • greenhouse gases absorb longer wavelengths • Greenhousegas moleculesrereleaseinfraredradiation

20. 16.2 Air Quality • Global warming refers to the trend of increasing global temperatures. North Pole

21. 16.2 Air Quality Name and describe 2 ways in which pollution affects ecosystems

22. 16.2 Air Quality How does the greenhouse effect keep Earth warm?

23. 16.2 Air Quality Explain how a build-up of CO2 in the atmosphere could increase Earths global temperature.

24. 16.2 Air Quality Greenhouse gasses are found close to earths surface and high above in the atmosphere. Name 2 important functions of greenhouse gasses at Earths surface.

25. 16.2 Air Quality Ocean producers such as phytoplankton are an important part of food webs, but they require a specific temperature range to survive. How might increased water temperature affect these ocean food webs?

26. 16.3 Water Quality KEY CONCEPT Pollution of Earth’s freshwater supply threatens habitat and health.

27. 16.3 Water Quality Objectives • Describe how water pollution affects ecosystems • Explain how biomagnification causes accumulation of toxins in food chains

28. 16.3 Water Quality Vocabulary • Indicator species • biomagnification

29. 16.3 Water Quality Biomagnification causes accumulation of toxins in the food chain. • Pollutants can move up the food chain. • predators eat contaminated prey • pollution accumulates at each stage of the food chain • Top consumers, including humans, are most affected.

30. 16.3 Water Quality 2 Types of Pollutants that undergo Biomagnification are PCBs and DDT • Polychlorinated biphenyls (PCBs) were widely used as coolant fluids • PCBs can negatively impact growth and development within the egg, causing • Genetic mutations • Deformities • Death

31. 16.3 Water Quality DDT was made available for use as an agricultural insecticide after WWII • In 1962, Silent Spring by American biologist Rachel Carson was published. • The book suggested that DDT and other pesticides may cause cancer and that their agricultural use was a threat to wildlife, particularly birds. • Its publication was one of the signature events in the birth of the environmental movement, and resulted in a large public outcry that eventually led to DDT being banned for agricultural use in the US in 1972. • The US ban on DDT is cited by scientists as a major factor in the comeback of the bald eagle, and the peregrine falcon from near-extinction in the contiguous US

32. 16.3 Water Quality How do PCBs affect bird populations through biomagnification?

33. 16.3 Water Quality Would a buffalo or a mountain lion be more affected by biomagnification? Why?

34. 16.3 Water Quality How does the biomagnification pyramid compare with the energy pyramid?

35. 16.4 Threats to biodiversity KEY CONCEPT The impact of a growing human population threatens biodiversity.

36. 16.4 Threats to biodiversity Objectives • Assess the consequences of loss of biodiversity • Explain how loss of habitat and introduced species affect ecosystems and biodiversity

37. 16.4 Threats to biodiversity Vocabulary • Habitat fragmentation • Introduced species

38. 16.4 Threats to biodiversity Preserving biodiversity is important to the future of the biosphere. • The loss of biodiversity has long-term effects. • loss of medical and technological advances • extinction of species • loss of ecosystem stability

39. 16.4 Threats to biodiversity Loss of habitat eliminates species. • Habitat fragmentation prevents an organism from accessing its entire home range. • occurs when a barrier forms within the habitat • often caused by human development

40. corridors can be road overpasses or underpasses • allow species to move between different areas of habitat • Habitat corridors are a solution to the problem.

41. 16.4 Threats to biodiversity Introduced species can disrupt stable relationships in an ecosystem. • An introduced species is one that is brought to an ecosystem by humans. • accidental • purposeful • Invasive speciescan have anenvironmentaland economicimpact.

42. 16.4 Threats to biodiversity Invasive species often push out native species. Burmese python (Florida Everglades) & mice (Australia) kudzu (southeastern United States)

43. 16.4 Threats to biodiversity List reasons that biodiversity is important to humans

44. 16.4 Threats to biodiversity How does habitat fragmentation affect migrating bird populations?

45. 16.4 Threats to biodiversity What types of damage can introduced species cause?

46. 16.4 Threats to biodiversity How could continued fragmentation reduce biodiversity?