of the receiving antenna, effects on sick people, affects under accident or other abnormal situations at the center of the beam and elsewhere both under short and long term exposure. liven though it has been pointed out that the projected effects on birds and on aircraft flying through the beam are negligible, a more precise determination should be made by actual experiments. 3.3.3 International Aspects In view of the obligations imposed by international law especially the Outer Space Treaty requiring avoidance of "adverse changes in the environment of the earth" and appropriate international consultations in case of potentially harmful interference— which have been reviewed in an earlier studyl27 — it Vjould seem that both the literal interpretation of the law as well as prudence on the part of the United States would require that it enter into consultations with other governments regarding the development and formulation of acceptable international standards of microwave exposure. The importance of such move cannot be overemphasized in view of the fact that a review of past practices appears to indicate wide divergence of views with respect to the determination of standards by different countries. As pointed out previously, the U.S. standard, which relates primarily to industrial or occupational type exposure, is 10 miliwatts per square centimeter whereas the more stringent U.S.S.R. standard is set at the level of 10
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