College of Education
Center of Excellence and Center of Training for Teacher Education GRADUATE SCHOOL
La Paz, Iloilo City, Philippines
Outline of the Topic for the Course PSC 504- The Atmosphere
Second Semester 2012-2013
PSC 504-THE ATMOSPHERE
THE CHANGING CLIMATE
PROF. RUTH GELVESON
KAREN S. SUMADIC M.A.Ed.-Biological Science
1. Describe several ways in which humans are changing the composition of the atmosphere 2. Review the atmosphere’s responses to human caused changes in the composition of the atmosphere 3. Contrast positive and negative feedback mechanisms and provide examples of each 4. Discuss possible consequences of global warming
Global Mean Temperature
Climate Feedback Mechanism
Positive Feedback Mechanism
Negative Feedback Mechanism
Human influence on regional and global climate did not just begin with the onset of the modern industrial period. There is evidence that people have been modifying the environment over extensive areas for thousands of years. The use of fire and the overgrazing of marginal lands by domesticated animals have both reduced the abundance and distribution of vegetation. By altering ground cover, humans have modified such important climatological factors as surface albedo, evaporation rates, and surface winds. Most scientists believe that human activity is altering the composition of the atmosphere by increasing the concentration of greenhouse gases (GHGs). Greenhouse gases occur naturally in the atmosphere and their presence results in what atmospheric scientists call the greenhouse effect. It is important to remember that the greenhouse effect is what keeps the earth warm enough to be habitable. The current concern is directed at an enhanced greenhouse effect, one that would put more heat-absorbing gases into the atmosphere, thereby increasing global temperatures. The enhanced greenhouse effect has been linked to increased GHG emissions from human activities. Engage
Capture the students’ attention, stimulate their thinking and help them access prior knowledge. The teacher will begin a discussion with: “What do you know about Global warming? What are some of the outcomes of global warming? Are there good effects of global warming? How about the negative effects? EXPLORE
Global Warming Experiment – Is it Getting Hot in Here?
Supplies: You will need:
1. two jars
2. two thermometers
3. two dark washcloths
4. a paper and pencil to record results
5. one lid
6. a sunny window
1. Put a dark washcloth inside each jar. Lay the jars on their side in the sunny window. 2. Lay one thermometer inside each jar facing up so you can read it. 3. Put a lid on one jar. Leave the other one open.
4. Watch the thermometers closely for 20 minutes. Check the temperatures every 2 minutes. 5. Record the time and temperatures.
6. After 20 minutes open the jars and remove the thermometers. Explain what you see.
Activity 2: Human Activity and Climate Change
1. Brainstorm possible human sources of GHGs. Read and discuss the given charts and graphs (Appendix A).
2. Encourage the students to compare the GHG graphs with other graphs (for example, global temperature and human population increases) during the same time span. Encourage them to come up with their own comparisons.
3. Ask students to discuss global emissions of GHGs. For example, the United States has only a small percentage of the world's population but emits a disproportionate share of the global [pic]. China has a population of over a billion people. What would happen if China "developed" to the point where most families owned an automobile that emitted [pic]?