50 points if you answer You should be familiar with some of the factors that have contributed to the rise in global temperatures over the past century. Think of three questions that will help you clarify your understanding of how these factors lead to an increase in global temperatures. Consider the following when you come up with your questions:

• Ways in which natural processes and human activity have affected global temperature change over the past century

• The influence of these processes and activities on a gradual or sudden change in global temperature