Columbia subject headings:
Harvard subject headings:
Climatic changes--Government policy--United States
Global warming--Government policy--United States
Greenhouse effect, Atmospheric--Government policy--United States.
Greenhouse gases--Government policy--United States.
Princeton subject headings:
Climatic changes--Government policy--United States.
Global warming--Government policy--United States.
Greenhouse effect, Atmospheric--Government policy--United States.
Greenhouse gases--Government policy--United States.