400 years in the future is not that much time in human scale. It's more than a generation, but with some luck your grandchildren's grandchildren will live then,

400 years in the future is not that much time in human scale. It's more than a generation, but with some luck your grandchildren's grandchildren will live then, it only takes a few anti-ageing advances, after all. > switch from earth based energy usage, to non earth based energy usage, or to even switch away from the concept of "energy" itself to fulfill increased economic growth. There's techno-optimism, there's sci-fi and there's... I sincerely hope our need for economic growth can be completely satisfied before we need to move on from energy to something else.