1. Summarize the scienti?c data that indicate global warming is occurring as a result of human activity.
2. What is the composition of Earth's atmosphere, and how has life a?ected the atmosphere during the past several billion years?
3. What is the greenhouse e?ect? What is its importance to global climate?
4. What is an anthropogenic greenhouse gas? Discuss the various anthropogenic greenhouse gases in terms of their potential to cause global warming.
5. What are some of the major negative feedback cycles and positive feedback cycles that might increase or de-crease global warming?