This dimension sorts energy sources by their basic class, renewable or non-renewable. Wikipedia notes that "primary energy can be non-renewable or renewable," the fundamental division that every energy source falls into. Browsing by source class keeps sources of the same basic kind grouped together.
Facts
Comparison
Era of Emergence Physical Basis Source Class
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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