A Big Technological Push
The Apollo project can teach us a lot about reaching seemingly impossible goals, and changing human civilization so that it survives in the long-term without destroying the ecosystems it depends on will certainly need us to show some of the same qualities that helped the moon landing happen. Like in the 1960s, existing technologies will have to be rapidly pushed to the next level, and new ones will probably need to be invented.
First we'll need vision, but once we know where we want to go, we'll have to stick with it and make the necessary efforts and sacrifices.
Photo credit: Public domain