Why has coal been such a prominent energy source? How can renewable energies be stored most effectively? Linking science to practical applications and social issues to realistic goals, this new series orients ecologically conscious readers toward the future of Harnessing Energy. With a special section on historical moments involving the energy source, details on key inventors and notable discoveries, and statistics to back up objective reports, each title seeks to present a fully contextualized history of the featured energy form. A must-have for any STEM unit dealing with energy studies. In this title examine the ways in which coal has historically been used as an energy source and how current and future energy demands are changing its technical applications and efficiency levels.