Columbia subject headings:
Environmental policy--Europe.
Environmental policy--Japan.
Environmental policy--United States.
Technological innovations--Economic aspects--Europe.
Technological innovations--Economic aspects--Japan.
Technological innovations--Economic aspects--United States.
Harvard subject headings:
Environmental policy--Europe
Environmental policy--Japan
Environmental policy--United States
Technological innovations--Economic aspects--Europe
Technological innovations--Economic aspects--Japan
Technological innovations--Economic aspects--United States
Princeton subject headings:
Environmental policy--Europe.
Environmental policy--Japan.
Environmental policy--United States.
Technological innovations--Economic aspects--Europe.
Technological innovations--Economic aspects--Japan.
Technological innovations--Economic aspects--United States.