Biomass is a renewable source of energy that comes from organic material such as animal waste, landfill gases, and plants, including trees, grasses, and corn. This book will show students the pros and cons of using biomass as an alternative energy source. Informational diagrams and color photographs add depth to the text and help readers understand how the biomass cycle of energy works. A robust focus on STEM subjects that are addressed in the Next Generation Science Standards encourages students to think like scientists and engineers.