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<br />Concluding Remarks <br /> <br />Six years of data on reported weather modification activities in the <br />United States do not allow reliable conclusions about the trends in Federal <br />and nonfedera1 experiments or operations. In particular, all estimates of <br />trends in the data were clouded by the data by CY 1977. a year of maximum <br />activity in weather modification. However, there is some evidence of in- <br />creases in State sponsorship of projects, in total target area, hours of <br />ground-based operations, and the use of dry ice and silver iodide as seeding <br />agents. On the other hand, there is some indication of decreases in the <br />number of commercial and Federal modifiers; in local community, municipal <br />water or conservation district sponsorship; in the use of po1ye1ectro1ytes <br />for fog modification; and in hours of seeding by aircraft. <br /> <br />REFERENCES <br /> <br />Charak, M.T. and DiGiu1ian, M.T., Weather Modification Activity Reports - <br />November 1, 1972, to December 31, 1973, National Oceanic and Atmospheric <br />Administration, Rockvi11e, Maryland, March 1974, 38 pp. <br /> <br />National Oceanic and Atmospheric Administration, Summary Report - Weather <br />Modification, Fiscal Year 1973, National Oceanic and Atmospheric <br />Administration, Rockvi11e, Maryland, December 1974, 154 pp. <br /> <br />National Oceanic and Atmospheric Administration, Weather Modification <br />Activity Reports, Calendar Year 1974, National Oceanic and Atmospheric <br />Administration, Rockvi11e, Maryland, March 1975, 37 pp. <br /> <br />~ <br /> <br />20 <br />