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

2. Earth’s human population continues to grow. Earth’s human carrying capacity is unknown. Why?

6. water

7. sunlight

8. Growing use of nonrenewable resources may lead to a crisis. How?

10. food and water

11. shelter

12. energy

16. Pollutants accumulate in the air. Pollution is any undesirable factor added to the air, water, or soil. Give two examples. 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

18. produced when pollutants in the water cycle cause rain pH to drop

19. can lower the pH of a lake or stream. What would this affect?

22. energy is absorbed and reradiated as heat (infrared)

23. greenhouse gases trap the infrared (heat) radiation acting like a blanket.

24. Do we want to get rid of the greenhouse effect? Why or why not?

25. Global warming refers to the trend of increasing global temperatures. Does this mean Wisconsin will be warmer in the future? North Pole

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

27. Water pollution affects ecosystems. How? Pollution can put entire freshwater ecosystems at risk.

30. Why has Earth's human carrying capacity increased greatly? A. Other organisms have been displaced by agriculture, so there is more space for humans. B. Humans have modified their environment due to technological advances. C. Humans can live closer together than other animals. D. Humans are now eating fewer plants than they used to. Correct Answer = B Which of the following is not a renewable resource? A. coal B. wind energy C. solar energy D. drinking water

31. Why has Earth's human carrying capacity increased greatly? A. Other organisms have been displaced by agriculture, so there is more space for humans. B. Humans have modified their environment due to technological advances. C. Humans can live closer together than other animals. D. Humans are now eating fewer plants than they used to. Correct Answer = B Which of the following is not a renewable resource? A. coal B. wind energy C. solar energy D. drinking water Correct Answer = A

32. What factor does not determine the size of an individual's ecological footprint? A. amount and efficiency of resource use B. amount of waste produced C. size of population D. toxicity of waste produced

33. What factor does not determine the size of an individual's ecological footprint? A. amount and efficiency of resource use B. amount of waste produced C. size of population D. toxicity of waste produced Correct Answer = C

35. Human population growth exerts pressure on resources

36. Changing to renewable resources can both lesson the pressure on non-renewable resources and reduce pollution

37. An individual’s carbon footprint expresses the amount of carbon that will be put into the atmosphere for that person over a given timeframe.

38. Individuals can lessen their impact on the environment through small changes.

39. The greenhouse effect is what keeps the Earth’s temperature moderate

40. Excess greenhouse gases can increase the temperature on Earth to unhealthy levels

41. Biomagnification is the increase in concentration of a pollutant further up a food chain.