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.
1820s
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Sources
United States Energy Information Administration Official Site
World Nuclear Association Information Library
World Nuclear AssociationContains: Uranium, Supply of UraniumQuote, Contains: Uranium, Supply of Uranium
Uranium is a relatively common element in the crust of the Earth (very much more than in the mantle). It is a metal approximately as common as tin or zinc.
Wikipedia
Wikimedia FoundationContains: Oil Shale, IntroductionQuote, Contains: Oil Shale, Introduction
Oil shale is an organic-rich fine-grained sedimentary rock containing kerogen (a solid mixture of organic chemical compounds) from which liquid hydrocarbons can be produced.
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