In this lesson, students are introduced to the concept of renewable and nonrenewable energy sources. By tracing their own energy supplies to the source, students learn that all energy on earth ultimately comes from the Sun. Students work in teams to research topics related to solar energy, creating a class database of information. Continuing their study of scarcity, students consider various effects of water scarcity on communities worldwide. They also compare the properties of salt water and fresh water. We recommend reading Chapter 3, which is included in this book selection and provides a module overview and summary. A materials list, safety notes, standards, teacher background information, assessment, and Internet resources are provided. This book selection also includes the Table of Contents, About the Editors and Authors, Appendix, and Index.