…a goodly number of us dreamers are going to ruefully reflect that it was entirely possible for humanity to establish off-planet settlements following the Apollo program. Settlements that likely could have been self-sustaining by now because in the alternate reality where humankind put as much effort and resources and brains as possible behind establishing populations outside this fragile egg basket we call Earth, the early ones could have been in orbit and on the moon in the 1980s.
There could have been nearly 40 years to chase the kinks out of the recycling loops and life support and hydroponics. To build solar power plants all over the darn place up there and drag a water-ice comet into Earth orbit if we couldn’t find enough to fling up to orbital colonies from Luna with mass drivers.
40 years to send more and more people up and for people to start being born up there.
40 years to establish a reservoir of human beings and our technological knowledge out of range of Kim Jong-Un and Kim Jong-Trump (brothers of another ego-rage-spiritual mother) and their shoe-on-podium nuclear chest-beating.