Columbia subject headings:
Harvard subject headings:
Climatic changes--Social aspects--Germany--Congresses.
Energy conservation--Social aspects--Germany--Congresses.
Energy policy--Social aspects--Germany--Congresses.
Environmental protection--Social aspects--Germany--Congresses.
Renewable energy sources--Social aspects--Germany--Congresses.
Sustainable development--Germany--Congresses.
Princeton subject headings:
Climatic changes--Social aspects--Germany--Congresses.
Energy conservation--Social aspects--Germany--Congresses.
Energy policy--Social aspects--Germany--Congresses.
Environmental protection--Social aspects--Germany--Congresses.
Renewable energy sources--Social aspects--Germany--Congresses.
Sustainable development--Germany--Congresses.