Conventional wisdom typically holds that harvesting “free” energy from the Sun with giant collectors in space does not make financial sense, at least until Earth's finite supplies of oil, coal and natural gas become so scarce that there's no other choice. The conventionally wise usually suggest that it will make more economic sense to rely on wind power and ground-based solar cells for “green” renewable energy. But now a panel of the International Academy of Astronautics (IAA), an elite ...

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