Columbia subject headings:
Harvard subject headings:
Energy industries--Technological innovations--Germany.
Energy industries--Technological innovations--Japan.
Energy industries--Technological innovations--United States.
Energy policy--Germany
Energy policy--Japan
Energy policy--United States
Renewable energy sources--Government policy--Germany.
Renewable energy sources--Government policy--Japan.
Renewable energy sources--Government policy--United States
Princeton subject headings:
Energy industries--Technological innovations--Germany.
Energy industries--Technological innovations--Japan.
Energy industries--Technological innovations--United States.
Energy policy--Germany.
Energy policy--Japan.
Energy policy--United States.
Renewable energy sources--Government policy--Germany.
Renewable energy sources--Government policy--Japan.
Renewable energy sources--Government policy--United States.