The list of parties to the Environmental Modification Convention encompasses the states who have signed and ratified or acceded to the international agreement prohibiting military use of environmental modification techniques.
On May 18, 1977, the Environmental Modification Convention (ENMOD) was opened for signature. North Yemen became the first state to deposit the treaty on 20 July 1977. The treaty came into force and closed for signature on October 5, 1978. Since then, states that did not sign the treaty can now only accede to it. The instrument of ratification, accession, or succession is deposited with the Secretary-General of the United Nations
As of 2022, 78 states have ratified or acceded to the treaty, most recently the State of Palestine on 29 December 2017. A further 16 states have signed but not ratified the treaty.
As of March 2013 the third review conference had not been scheduled as there were under 10 respondents showing interest in reconvening.
List of parties State Signed Ratified or Acceded Method Accession Accession Succession from Accession Accession Ratification Accession Accession Ratification as Ratification Ratification Ratification Ratification Accession Ratification Accession Accession Accession Accession Ratification Ratification Succession from Signed 18 May 1977Ratified 12 May 1978 Ratification The U.S. Department of State lists Dominica as giving notice that it would continue to be bound by the treaty on 8 November 1978. Succession from Accession Accession Ratification Ratification as Also Signed 18 May 1977Ratified 25 May 1978 Ratification Accession Accession Accession Ratification Ratification Ratification Ratification Accession Accession Accession Accession Ratification Accession Accession Accession Ratification Ratification Accession,includes and Ratification Accession Accession Ratification Accession Accession Accession Accession Ratification Ratification Ratification as The U.S. Department of State lists Saint Lucia as giving notice that it would continue to be bound by the treaty on 22 February 1979. Succession from The U.S. Department of State lists Saint Vincent and The Grenadines as giving notice that it would continue to be bound by the treaty on 27 October 1979. Succession from Accession Succession from Signed 18 May 1977Ratified 12 May 1978 Accession Succession from Accession Ratification Ratification Accession Accession Accession Ratification Ratification as Ratification Ratification Accession Accession Accession Ratification as also acceded 12 June 1979 prior to Yemeni unification.
States that have signed but not ratified State Signed Signed as
States that have not signed 101 UN member states have never signed the treaty.
The Cook Islands and Niue, two associated states of New Zealand which have had their "full treaty-making capacity" recognised by United Nations Secretariat, are not parties to the treaty but are bound by its provisions by virtue of their administration by New Zealand when the latter ratified the ENMOD convention.
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