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We've been 10 years away from usable fusion reactors, but SPARC is expected to have net energy production by around 2034. That really could be a game changer.
Aside from the significant uncertainty that Fusion will ever be practical (the fact we're running out of Tritium being just one problem), I really wouldn't advise looking to tech for solutions. Relentless consumerism takes any new invention and finds ways to be more destructive with it. Your new invention makes a lot of things more energy efficient? Well, fossil fuel stores that were previously too marginal to exploit just became viable; the drilling starts tomorrow. And so on.
We've been 10 years away from usable fusion reactors, but SPARC is expected to have net energy production by around 2034. That really could be a game changer.
Could being the operative word.