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Environmental protection. Environmental technology --- Relation between energy and economics --- European Union --- Energy policy --- Energy facilities --- Environmental aspects --- 620.91 --- -Energy policy --- -Energy and state --- Power resources --- State and energy --- Industrial policy --- Energy conservation --- Energy resources in general. Natural sources of energy --- -Government policy --- -Energy resources in general. Natural sources of energy --- -620.91 --- 620.91 Energy resources in general. Natural sources of energy --- -620.91 Energy resources in general. Natural sources of energy --- Energy and state --- Factories --- Energy policy of EEC(Environmental effect) --- EEC energy policy