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We have mostly solved the energy crisis, in the sense that we have the technical means to supply ourselves with power we can use, and in a sustainable way. Implementing that solution will require rather sweeping political and economic upheaval though, so the question remains for how much longer we'll continue to fuck the Earth's ecosystem before we get around to it (if indeed we ever get around to it at all).

As usual, mankind's biggest problems arise from our inability to scale social interaction well, not from technical prowess (or lack thereof).

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