Environmental: The presently accepted maximum power densities are inferior or equal to 10 W/cm2. It will be difficult to use denser beams. What influence will a permanent beam of this sort have on the different layers of the atmosphere and ionosphere? If other means are employed (lasers, particle beams) what effects will they have on the near-earth environment? Not originally destined for Earth, this energy becomes stricto sensus a kind of pollution. One may assume, however, that if it is not supplied in this way, an equivalent energy source will be extracted from terrestrial resources. Economic: From now on, this is a world issue — one that must consequently
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