The good news is that the big names in nuclear energy -- like Areva, Hitachi, General Electric and Toshiba -- have recently been joined by a bevy of high-tech start-ups seeking to develop advanced nuclear-reactor designs for both fission and fusion energy production.
Current designs can produce two kilowatts per cubic meter of liquid reactor volume and without any drawbacks (some models produce methane as a by-product, this tech does not).