Convention on the Prohibition of Military or Any Other Hostile Use of Environmental Modification Techniques
U.S. Department of State Bureau of International Security and Nonproliferation
Signed in Geneva 18 May 1977 Entered into Force 5 October 1978
Both the U.S. Senate and the House of Representatives held hearings, beginning in 1972, and the Senate adopted a resolution in 1973 calling for an international agreement “prohibiting the use of any environmental or geophysical modification activity as a weapon of war….”
Link To Document
Thanks to RW for sharing with us @ ZG!