The Global Change Instruction Program was designed by college professors to fill a need for interdisciplinary materials on the emerging science of global change. This instructional module introduces the basic features and classifications of clouds and cloud cover, and explains how clouds form, what they are made of, what roles they play in determining climate, and how they both cause and are affected by climate changes. The materials are designed for undergraduate students lacking in advanced training in mathematics and the technical aspects of science. The module is divided into two main sections covering clouds and cloud formation, and clouds and climate; a conclusion; six questions and projects; three appendices; a glossary; and 20 additional reading materials. Section I provides text and diagrams of cloud classification and occurrence, cloud composition, and the underlying physics of cloud formation. Similarly, section II covers changes in Earth's climate from clouds and from carbon dioxide, and cloud-climate feedbacks. Appendices describe cloud patterns on other planets, the energy of clouds, and an activity that involves forming clouds in a bottle. (LZ)