This book contains 23 suggestions for experiments involving environmental science that can be used to create a science fair project. Aimed at grades 10-12, a wide range of environmental topics is covered. These topics include soil ecosystems, aquatic ecosystems, applied ecology, global warming and the greenhouse effect, deforestation and desertification, indoor plumbing, problems with fossil fuels, and alternative energy sources. Each experiment includes an overview of the topic, in-depth background material, step-by-step procedures and alternative methods, procedures for analyzing data, helpful illustrations, suggestions for going further, and bibliographic references. The book also includes tips on designing science fair projects and information on using materials for each one. (AIM)