These brief books present balanced--even scholarly--overviews of major energy sources. Workmanlike prose covers some history for each source; describes capturing/production techniques; and, importantly, examines the contributions and costs of each source: e.g., the relative safety of non-extractives such as solar and wind power versus the lesser yields, intermittent production, and effects on wildlife. Excellent captioned photos illustrate the texts. Reading list, websites. Bib., glos., ind.