The idea of space-based solar power has been in research since the early 1970s. I believe this is a doable technology (today) and an inevitable technology that will happen (at some point) and it offers the only large scale chance we have of reducing CO2 from coal use and therefore mitigating climate change.
Here is a cool video that describes John Mankin's vision of the future, that was presented at the National Press Club in Washington DC by the NSS, and is part of the recent NSSO Study:
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