Question

1. Examine the colored chart at the bottom of the screen. It is divided into five categories. Roll over the icons (right side) to see what five categories are displayed. The first one has been answered for you.

1	2	3	4	5
food /agriculture

2. Each diamond on the chart represents an event that happened. Go to the year 400 and click on the diamond to find out what new technology occured. A new screen will open with more information. What was this technology and why would it have an impact on population growth?

3. Click on other diamonds to find out impacts on human populations. Complete the chart below with 4 “events” that impacted human growth.

Year	Event	Why did it affect growth?

4. Use the tool at the bottom to move through time. (slide to right). How did the number of dots on the map change? What areas were the most populated in 1800?  

5. You can use the magnifying glass to zoom into areas in the 1990’s and 2000’s. What “people and society” event happened in 1980 that was aimed at population growth?

6. You can use the magnifying glass to zoom into areas in the 1990’s and 2000’s. What agricultural problem occurred in 2006?

7. The timeline makes predictions about the future. What year are they predicting there will be freshwater shortages? Suggest how this shortage may affect the human population.

8. The top menu has a button called overlays.Use the dropdown menu to select “Fossil Fuel CO2 Emissions.” What happens to CO2 emissions between 1751 and 2010? How do you know?

9. In the year 2000, which areas had the most CO2 emissions? How do you know?

10. Use the dropdown menu to overlay fertility rate. Move the slider to 1950. What was the average number of children per woman in the US at this time? What was the fertility rate in the year 2000? What do these two numbers tell you about the population of the United States?

Examine the graph shown below: CE = Common Era

11. The graph starts in the year 1 C.E. How many years did it take for the population to reach 1 billion people?

12. It took 123 years to grow from 1 billion to 2 billion people. How long did it take to get from 6 billion to 7

billion people? What does this mean about the rate of population growth?

13. Suggest a reason why the population grew so slowly before the 1800s.

Examine the graph below. (SOURCE: EPA)

14. What type of greenhouse gas is the most prevalent worldwide?

15. What human activities contribute CO2 to the atmosphere (hint: look at the graph for clues)?

16. A “greenhouse gas” is one that absorbs infrared radiation (heat) and traps that heat in the atmosphere. The greenhouse effect is a naturally occurring effect that is important to life on the planet. Without this effect, the earth would be too cold for life to exist.  

How does an excess amount of CO2 in the air contribute to Earth’s warming? Use the diagram for reference.

17. Are greenhouse gases good, bad, or neither? Explain your answer.

Examine the graph below. (SOURCE: NASA)

18. Which greenhouse gas is being graphed?

19. What is the main take-away from this graph. Summarize what is being shown.

20. What is causing the spike at the end of the graph?

A pair of northeast looking photographs, both taken from the same location on the west shoreline of Muir

Inlet, Glacier Bay National Park and Preserve, Alaska showing the changes that have occurred to Muir

Glacier between September 2, 1892 and August 11, 2005.

22. How does this set of photographs relate to the human population? (Consider everything you have learned so far in this module.)

23. Connect the photo above to the diagram on the right showing sea level changes. How are they connected?

24. FINAL SYNTHESIS.

Consider all of the data, graphs and information you have just learned. Discuss how human populations have an overall impact on the planet?

Answer 1

ANS (17)-Green house gases are both good and bad.

EXPLANATION-Green house gases are those gases that trap the heat released from the sun and results in an increase in the temperature of the earth. The gases are-water vapor, methane, ozone, Nitrous oxide, chlorofluorocarbon.

Good effect of greenhouse gases	Bad effect of greenhouse gases.
They maintain the temperature of the earth by absorbing the heat emitted from sun radiations.	They are the main cause of global warming(an increase of earth temperature by an increase in the level of CO2, CFCs, and other pollutants. ).
They filter-outs the unwanted and harmful radiations to falling on earth from the sun and results in protecting the humans and other organisms from them.	Sea level get rises due to the melting of ice, as the water level of earth got disrupted because water vapor has a major contribution to greenhouse gases.
They help farmers in growing the offseason crops.and also offers the long growing season for cultivation purposes.	They disrupt the pattern of weather, rainfall on earth.
These gases are utilized by solar power heater to heat the water.	Life of the ecosystem gets disrupted.