Clean energy

https://www.wikidata.org/wiki/Q1962383

Field Hierarchy

Parent
Engineering 25M papers	Geography 13.2M papers	Economics 12.4M papers	Environmental science 8.8M papers
Environmental engineering 971k papers	Natural resource economics 482k papers	Environmental economics 378k papers	Environmental protection 307k papers
Current
Clean energy 3,187 papers
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History