Columbia subject headings:
Capitalism--Environmental aspects.
Energy industries--Political aspects.
Energy policy--Political aspects.
Petroleum industry and trade--Environmental aspects.
Petroleum industry and trade--Political aspects--Mexico.
Petroleum industry and trade--Political aspects.
Renewable energy sources.
Harvard subject headings:
Capitalism--Environmental aspects.
Energy industries--Political aspects.
Energy policy--Political aspects.
Petroleum industry and trade--Environmental aspects
Petroleum industry and trade--Political aspects
Petroleum industry and trade--Political aspects--Mexico.
Renewable energy sources
Princeton subject headings: