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<br />forest health, sensitive species, ranching, and tourism can all benefit from additional <br />runoff. <br /> <br />Weather modification is still a comparatively young science and technology. The <br />following is paraphrased from a draft WMA Statement (2004). Although the <br />fundamental principles and the primary cloud treatment strategies involved are <br />reasonably well understood and a substantial body of evidence regarding the <br />effectiveness of cloud seeding exists, the discipline is still evolving. Attainment of <br />desirable WxMod effects depends upon several factors. Challenges include detennining <br />and defining the conditions under which predictable and consistent effects may be <br />achieved, and establishing and executing the most effective cloud treatment strategies. <br /> <br />Programs in Operation <br />International <br /> <br />In the WMO's annual register of National Weather Modification Projects, 24 countries <br />provided infonnation on more than 100 ongoing WxMod activities in 1999. China is the <br />most active country pursuing WxMod with an investment of over $40 million annually. <br />The primary activity in Europe is hail suppression. Figure 2 shows countries with active <br />cloud seeding programs. <br /> <br />Figure 2 - Countries with Active Cloud Seeding Programs <br /> <br />-- <br /> <br />eountrl.. willi .,live <loud "odlnl pro...m.... <br /> <br /> <br />.~ <br />I <br />s <br />~ <br />~ <br />~ <br />~ <br />'" <br />Ii <br />Ii <br />~ <br /> <br />-11- <br />