The high power of the beam can potentially interfere with radar, microwave and radio frequency communications. For this reason, rectennas need to be located away from traffic areas. NASA studies indicate that heat released by microwave transmission of power to a rectenna would be in the order of 15 watts per square meter. Some values for comparison are: 4 for a suburban community, 600 for a large industrial city, 100 for a thunderstorm or normal lake evaporation and 100,000 for an erupting volcano. Policy Considerations As this proposal from Project Phoenix demonstrates, there are positive options available for confronting the problem of global warming. In fact, antidotes for global warming could also speed a successful transfer to other energy sources before fossil fuels run out. Problems that take centuries to create will not be wished away or solved by scattered local and individual efforts. They require orchestration on a national and international level and on a scale that will inherently take time. Ilie sheer size of the effort will require sacrifice by all. To bring recognition and consent for the massive effort required, the international public will have to be shown the options. The design disciplines have a critical role to play here in conceptualizing and visualizing these options for both leaders and public. The Greenhouse problem should be treated as an insurance problem, not as a public works problem. If action must await proof of necessity, proof may take too long. Action as insurance, although bought under uncertainty, will justify the risk in the worst case - and, if well conceived, will show benefits in any case. Best of all, well-conceived projects have the potential for contributing significantly to both the world economy and world well-being. REFERENCES (Note: References are not cited by number in the text) Books [1] Agrawal, Bru N. (1986) Design of Geosynchronous Spacecraft. Englewood Cliffs, NJ: Prentice Hall. [2] BECKEY, Ivan AND Daniel Herman. (1985) Space Stations and Space Platforms: Concepts, Design Infrastructure and Uses. New York: American Institute of Aeronautics and Astronautics, Inc. [3] FIVE Year Research Plan. (1987) 1987-1991 National Photovoltaics Program. Washington: Photovoltaic Energy Technology Division, Office of Solar Electric Technologies, U. S. Department of Energy. [4] MENDELL, W. W., ED. (1985) Lunar Bases and Space Activities of the 21st Century. Houston: Lunar Planetary Institute.
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