The modern world relies on powerful energy sources to light up cities, heat homes and buildings, fuel vehicles, and more. This series explores a wide variety of energy sources that are used around the globe today. It also examines the positive and negative impacts of each and discusses how the energy sources may be used in the future. Additional features include a table of contents, infographics to help readers learn more about the topic, sidebars, a fast facts section, critical-thinking questions, a phonetic glossary, an index, an introduction to the author, and sources for further research.