As the human population grows, demand for Earth's resources increases and puts pressure on renewable and nonrenewable resources. Technological advances have helped increase Earth's carrying capacity by supporting agriculture and medicine. However, fossil fuel emissions contribute to pollution and climate change, affecting the biosphere. Air pollution from fossil fuels can harm human health and the environment through effects like smog, acid rain, and the greenhouse effect. Pollution also threatens freshwater ecosystems and enters the food chain through biomagnification.

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?

3. Technology has helped to increase Earth’s carrying capacity. Like what?gas-powered farm equipment

4. medical advancementsThe growing human population exerts pressure on Earth’s natural resources. How?Nonrenewable resources are used faster than they form.CoalOilNatural gasUranium (for nuclear power)Minerals (especially rare heavy metals for technology)

5. Renewable resources cannot be used up or can replenish themselves over time. Name three examples.wind

6. water

7. sunlight

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

9. Resources must be properly managed.Effective management of Earth’s resources will help meet the needs of the future. Earth’s resources must be used responsibly. Why?Careless use of resources makes them unavailable to future generations.Easter Island isan example ofirresponsibleresource use.Removal of trees An ecological footprint is the amount of land needed to support a person.What must the land be able to produce and maintain?

10. food and water

11. shelter

12. energy

13. wasteHow can you lessen your environmental footprint?http://www.carbonfootprint.com/calculator.aspxUse the calculator to determine your footprint and check the CO2 Reduction list for some easy ways to reduce your impact.

14. Several factors affect the size of the ecological footprint.amount and efficiency of resource use

15. amount and toxicity of waste producedKEY CONCEPT Fossil fuel emissions affect the biosphere.

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 airpollutants produced by fossil fuel emissionsmade of particulates and ground-level ozone

17. Smog can be harmful to human health. How?Acid rain is caused by fossil fuel emissions.

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?

20. can harm trees. How?Air pollution is changing Earth’s biosphere. What is the biosphere? The levels of atmospheric carbon dioxide rise and fall over time.High levels of carbon dioxide are typical of Earth’s warmer periods. Why?

21. carbon dioxide(CO2)methane (CH4)water (H2O)The greenhouse effect slows the release of energy from Earth’s atmosphere.sunlight penetrates Earth’s atmosphere

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