Weather Modification WASHINGTON, July 2—The United States has been secretly seeding clouds over North Vietnam, Laos and South Vietnam to increase and control the rainfall for military purposes.
Government sources, both civilian and military, said during an extensive series of interviews that the Air Force cloud seeding program has been aimed most recently at hindering movement of North Vietnamese troops and equipment and suppressing enemy antiair craft missile fire.
The disclosure confirmed growing speculation in Congressional and scientific circles about the use of weather modification in Southeast Asia. Despite years of experiments with rainmaking in the United States and elsewhere, scientists are not sure they understand its long‐term effect on the ecology of a region.
