Fusion is hardly efficient especially the way the silly dorks want to implement it. Just technically it could use deuterium harvested from seawater. Or the moon. So could be cheaper than fossil fuels one day. The powerplant still requires sugars, starches, hydrogenated carbons, and amino acids 2 be built. And they'd still be a huge investment. Fusion would be a great space based powerplant though. The fuel is more energy dense than oil, coal, natural gas, it does get mostly wasted however.
I suppose fancy batteries, or iron, and then, lastly hydrogen is the best way to store thrust. The last two still require oxidizers I guess? None of it's fresh in my mind.
People are energy inefficient compared to most lifeforms. So we should replace them with lizards or machines that can powersave. The cool thing though is a human is efficient enough to walk an ox to death. In that particular context.. And our brains clever enough to design more efficient technology that can survive being off.
Thinking about it less people with more machines would be more efficient. So that's probably on the agenda for those who feel entitled to control others.
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