Columbia subject headings:
Climatic changes--Law and legislation--European Union countries.
Emissions trading--Law and legislation--European Union countries.
Environmental law, International.
Global warming--Law and legislation--European Union countries.
Greenhouse gas mitigation--Law and legislation--European Union countries.
Harvard subject headings:
Climatic changes--Law and legislation--European Union countries.
Emissions trading--Law and legislation--European Union countries.
Environmental law, International.
Global warming--Law and legislation--European Union countries.
Greenhouse gas mitigation--Law and legislation--European Union countries.
Princeton subject headings:
Environmental law, International.
Environmental law--European Union countries.