This dimension groups energy sources by the era in which they were first put to commercial use. Wikipedia notes that "renewable energy systems have rapidly become more efficient and cheaper over the past 40 years," a commercial history that stretches back much further for some sources than others. Browsing by first commercial era lets a visitor compare sources that entered commercial use in the same period.
Facts
Comparison
Era of Emergence Physical Basis 20th century
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Sources
1. Fossil fuel - Wikipedia
Fossil fuel, Importance section, commercial exploitation sentence
Commercial exploitation of petroleum began in the 19th century.
Fossil fuel, Origin section, formation sentence
The origin of fossil fuels is the anaerobic decomposition of buried dead organisms.
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