Columbia subject headings:
Environmental policy--Moral and ethical aspects--United States.
Environmental policy--Moral and ethical aspects.
Environmental policy--United States--Moral and ethical aspects.
Environmental policy--United States.
Environmental policy.
Harvard subject headings:
Environmental ethics.
Environmental policy--Moral and ethical aspects
Environmental policy--United States
Environmental policy.
Princeton subject headings:
Environmental policy--Moral and ethical aspects.
Environmental policy--United States--Moral and ethical aspects.
Environmental policy--United States.
Environmental policy.