Columbia subject headings:
Environmental policy--Canada.
Natural resources--Government policy--Canada.
Pollution--Economic aspects--Canada.
Pollution--Social aspects--Canada.
Harvard subject headings:
Environmental policy--Canada
Pollution--Economic aspects--Canada.
Pollution--Law and legislation--Canada.
Pollution--Social aspects--Canada.
Princeton subject headings:
Environmental policy--Canada.
Natural resources--Social aspects--Canada.
Pollution--Economic aspects--Canada.
Pollution--Law and legislation--Canada.
Pollution--Social aspects--Canada.