Columbia subject headings:
Economic development--Environmental aspects--European Union countries--Congresses.
Economic development--Environmental aspects--Germany--Congresses.
Energy policy--European Union countries--Congresses.
Energy policy--Germany--Congresses.
European Union--Congresses.
Harvard subject headings:
Economic development--Environmental aspects--European Union countries--Congresses.
Economic development--Environmental aspects--Germany--Congresses.
Energy policy--European Union countries--Congresses.
Energy policy--Germany--Congresses.
European Union--Congresses.
Princeton subject headings: