Some subject searches to try in SOLO
Nuclear fuels -- Law and legislation
Hazardous substances -- Law and legislation
Refuse and refuse disposal -- Law and legislation
For specific regimes you could try adding a designation matching your interest eg European Union countries or Great Britain
If interested in the law of the sea:
Marine pollution -- Law and legislation
Oil pollution of the sea -- Law and legislation
Radioactive waste disposal in the ocean (International law)
Radioactive substances -- Transportation (International law)
History
OECD in 26th May 1972, and again 14th November 1974.
1992 Rio Declaration included PPP as Principle 16