Columbia subject headings:
Climatic changes--Government policy--Canada.
Greenhouse gas mitigation--Economic aspects--Canada.
Harvard subject headings:
Air quality management--Government policy--Canada.
Air--Pollution--Economic aspects--Canada.
Air--Pollution--Law and legislation--Compliance costs--Canada.
Aur quality management--Government policy--Canada.
Greenhouse gas mitigation--Economic aspects--Canada.
Princeton subject headings: