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The microwave flux at the Earth side is to low to be a weapon. There are much much better weapons at hand already ready to be used. Your just sewing unfounded fear with an imagined microwave nightmare. Oil will always be a valuable commodity for chemical feedstock even if it was replaced by cleaner energy. In fact the energy would be better used in space without return to earth. The solar flux in orbit is 8 times that of the surface so space energy is practical and mirrors made of super lightweight films (films impractical on earth) could be a solution that is high power and light weight.