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<br />tion such as when, how much, how often, and with what side <br />I <br />effects. For the most part, thi$ 1nformation is not available <br />, <br />from today' s technology. Assumptions must be made about the <br />effectiveness of the technology thereby assuring that the <br />economic evaluation is also uncertain (17). <br /> <br />2.3 Environmental Concerns <br /> <br />The management of any resource, including precipitation, <br />will lead to secondary ecological changes. Therefore, when <br />considering the use of weather~ modification, the question <br />of how the ecosystem might change lwi th a precipitation increase <br />i <br />and with the type of seeding material to be applied must be <br />addressed. Measuring the envirbnmental changes resulting <br />from weather modification is even more difficult than measuring <br />the effects of seeding on the weather itself. Any ecological <br />changes that may result from long periods of modified weather <br />will evolve slowly, and most past icloud seeding projects have <br />not been conducted for suffici~nt periods of time to allow <br />for such evolution, or have not mqnitored such changes. <br /> <br />The information provided ,in this chapter addresses a <br />number of major concerns. Severa~ referenced sources provide <br />additional information. <br /> <br />2.3.1 Impacts on Weather Elements. The impacts of cloud <br />seeding on a storm system as i tl passes over a project area <br />as well as the larger scale effects are frequently questioned. <br />The following conclusion was reached in a 1979 report to the <br />President and the Congress on "~ationalWeather Modification <br />Policies and Programs": <br /> <br />2-9 <br />