Columbia subject headings:
Conservation of natural resources--Government policy--United States.
Energy policy--United States.
Renewable natural resources--Government policy--United States.
Harvard subject headings:
Conservation of natural resources--Government policy--United States.
Energy policy--United States
Renewable natural resources--Government policy--United States.
Princeton subject headings:
Conservation of natural resources--Government policy--United States.
Energy policy--United States.
Renewable natural resources--Government policy--United States.