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Well, yeah, things like O'Neill Cylinders are the goal! But you still need to build it first, and it cannot be done with the resources left on Earth.
We have a very limited window of time, as a species, to put enough infrastructure from Earth into space before we run out of the raw materials and energy necessary to have a chance to build that. It should be humanity's unifying goal right now.
The damage to the biosphere of Earth has progressed to a point where, if we do not bring in external resources and energy, industrial civilization will cease to exist as the increasingly unpredictable and more hostile environment slowly degrade our existing industrial systems and infrastructure to the point where it will no longer be possible to muster enough energy and mass to launch and leave Earth. I figure that the end will be by 2100-2150 or so as the real deadline. I've come up with that by extrapolating the climate models, particularly the IPCC reports in the 'business as usual' scenarios.
Even if we choose not to commit to space, if humanity does not start geoengineering approaches to extend our time, we're functionally extinct by 2200 or so. The cheapest and easiest option is stratospheric aerosol injection of sulfur dioxide. It's also the safest option as well, as we have good data on the global effects of this from the Mt. Pinatubo eruption in 1991 which caused global cooling by so much sulfur dioxide that - well, it's an investment necessary to see things really change, and get ourselves to the finish line - which I measure as enough infrastructure within our time constraints being launched to enable the next steps.
It's great to have the final goal in mind, but that's the picture you need to have even today as we take the necessary relatively mundane steps to enable the beautiful future we want. We won't live to see it. But it would be nice to live long enough to see the seed to get there accomplished.
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