This title examines the history and use of algae as a source of energy, the pros and cons of the technology, and next steps for this important energy source. This book also includes a table of contents, an infographic, informative sidebars, a That's Amazing special feature, quiz questions, a glossary, additional resources, and an index. This Focus Readers title is at the Navigator level, aligned to reading levels of grades 3-5 and interest levels of grades 4-7.