January 2015 Published .
Environmental Weather Modification ..
 ENMOD does not ......hinder the use of environmental modification techniques ...for peaceful purposes and is without prejudice to the generally recognized principles and applicable rules of international law concerning such use.

Definition of environmental modification technique
Any technique for changing — through the deliberate manipulation of natural processes — the dynamics, composition or structure of the earth, including its biota, lithosphere, hydrosphere and atmosphere, or of outer space.

 On 5 November 2001, the United Nations General Assembly declared 6 November of
each year as the International Day for Preventing the Exploitation of the Environment in
War and Armed Conflict (A/RES/56/4).

For more information:
More info at this link .. https://climateviewer.com/downloads/ENMOD-Fact-Sheet-Jan2016.pdf