Columbia subject headings:
Harvard subject headings:
Energy conservation--European Union countries.
Energy conservation--Germany.
Energy consumption--European Union countries.
Energy consumption--Germany.
Energy policy--Social aspects--European Union countries.
Energy policy--Social aspects--Germany.
Princeton subject headings:
Energy conservation--European Union countries.
Energy conservation--Germany.
Energy consumption--European Union countries.
Energy consumption--Germany.
Energy policy--Social aspects--European Union countries.
Energy policy--Social aspects--Germany.