Columbia subject headings:
Harvard subject headings:
Automobiles--Motors--Exhaust gas--Law and legislation
Carbon dioxide mitigation--Law and legislation.
Transportation and state.
United Nations Framework Convention on Climate Change Protocols, etc.
Princeton subject headings:
Automobiles--Motors--Exhaust gas--Law and legislation.
Carbon dioxide mitigation--Law and legislation.
Transportation and state.
United Nations Framework Convention on Climate Change Protocols, etc.