Imagine that you are a scientist studying global warming. You’ve been asked to speculatewhether we are in the midst of a period of global warming. How could you tell whetherwe are in a period of global warming? (Hint: What did you learn about carbon dioxidelevels during the Ice Age?) What effect do you think any environmental change willhave on animals living today? Do you think we should try to stop global warming? Ifso, what should we do?