RT null T1 Selected multilateral treaties in the field on the environment A1 United Nations Environment Programme, K1 law K1 policy K1 treaty PB United Nations Environment Programme YR 1992 FD 1992 LK https://wedocs.unep.org/handle/20.500.11822/8307 UL https://wedocs.unep.org/handle/20.500.11822/8307 NO These conventions contain the essential substance of international environmental law DS UN Environment Document Repository RD Sep 19, 2026