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economia de energia
econ.	Energieeinsparung f
environ.	Energiewirtschaft f
environ., energ.ind.	Energiesparen n
economia da energia
econ., el.	Energiewirtschaft f
economias de energia
environ., energ.ind.	Energieeinsparung f

economia de energia: 11 phrases in 4 subjects

Energy industry	4
Environment	5
General	1
Natural sciences	1