the only real need for SPS comes from present developing countries, since they total 46 from the 54 units proposed in 2100. The five principal regions where SPS looks like a potential long term solution are Asia Oceania. Latin America, India. China and West tropical Africa. All of these countries will experience high demand for electricity if the population and development projections of our scenario arc correct. They will represent at that time 8.4 billion inhabitants, with densities often more than 1000 inhabitants per km2The map given figure 3 is an illustration of this distribution: each . represents a 10 km2 solar power plant unit, each 0 represents one SPS antenna. So it clearly appears that this type of technology has no chance to be developed if there is not either 1) a significant development of industrial capacities from the Southern countries to build by themselves original space technologies, or 2) a huge effort from present industrialized countries to build and transfer very sophisticated technologies to the Third World, since cheaper and environmentally safe terrestrial solar solutions could be implemented for the North alone, without insurmountable difficulties. Indeed, one could say that these conclusions were included in the main assumptions of our scenario, since a real development of Southern countries and a considerable effort of Northern countries to promote energy efficiency at home first, are
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