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Energy conservation --- Power resources --- Renewable energy sources. --- Alternate energy sources --- Alternative energy sources --- Energy sources, Renewable --- Sustainable energy sources --- Renewable natural resources --- Agriculture and energy --- Energy --- Energy resources --- Power supply --- Natural resources --- Energy harvesting --- Energy industries --- Conservation of energy resources --- Conservation of power resources --- Rational use of energy --- RUE (Rational use of energy) --- Conservation of natural resources --- Energy consumption --- Energy policy --- Recycling (Waste, etc.) --- Conservation de l'énergie --- Conservation des ressources énergétiques --- Energie besparing --- Energie hernieuwbare bronnen --- Energie kosten besparing --- Energiebronnen [Hernieuwbare ] --- Energy sources [Renewable ] --- Hernieuwbare energiebronnen --- Maîtrise de l'énergie --- Renewable energy resources --- Ressources énergétiques -- Conservation --- Ressources énergétiques renouvelables --- Sources d'énergie renouvelables --- Économie d'énergie --- Énergie -- Maîtrise --- Énergie -- Économie --- Énergie -- Économies --- Énergie renouvelable --- Énergies alternatives --- Énergies de remplacement --- Énergies douces --- Énergies nouvelles --- Énergies renouvelables --- Renewable energy sources --- Ressources énergétiques --- Économies d'énergie --- Economies d'énergie --- Ressources énergétiques --- Energies renouvelables --- Power resources. --- Energy conservation. --- Énergies renouvelables. --- Ressources énergétiques. --- Économies d'énergie. --- 620.9 --- 620.9 Economics of energy in general --- Economics of energy in general