Excuse me for the obvious. If we could "solve" the long term issue of generating abundant, reliable electricity independently of coal, oil, nuclear, natural gas, wind and solar, we would be a big step further towards environmental balance, and the capability for long term space travel/living. However, there is ALWAYS unanticipated effects, the Artic storm in the U.S. West is an example for our current electrical technologies. Personal opinion: we are destined to rely increasingly on fossil fuels to our eventual detriment.