The development of an economically feasible, functional nuclear fusion reactor.
This would really be the benchmark for humanity to enter a new era - all the great things you people talk about (solutions for world hunger, water shortage, global warming), they all begin at that point.
Although I predict this new era will being with a nice, cosy World War as the result of the rapid reshaping of the world economy - so yeah, it's gonna be an interesting time to live in, if any of us ever gets to see it...
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