I’d have to go with fusion power. It definitely exists and is possible, but is still in the research phase and always remains slightly out of reach, but ITER is being built in France which should be able to produce a tenfold increase in energy output over input. Additionally, new discoveries are being made all the time in how fusion devices could be miniaturized. Imagine near limitless clean energy and fossil fuels becoming redundant.
Honestly, 3D printing. It’s gonna be freaking ridiculous once it gets even better. It’s essentially a portable factory, my brother was doing research on 3D printing ceramics, like that’s insane and so cool and it’s definitely gonna have a HUGE impact in the future. Those are some of the biggest ones I’ve seen so far.
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