1. Take apart the earth, use it to build a fleet of smaller habitats that make use of the materials to generate maximum sustainable habitat space.

2. Distribute these habitats into combinations of nature preserve biomes, agricultural systems and urban centers.

3. All habitats should be given sufficient technological infrastructure to power all their life support with some extra. All habitats should have internet capabilities and backup stores of all human knowledge.

4. Redistribute the population of earth into their preferred habitat with the kinds of people they would prefer to be around, pole them if needed.This includes isolating ideologies that cannot abide any other ideologies away from other habitats.

5. Dedicate a small portion of habitats to ferry services that take regular routes between other habitats. Arrange routes so that individuals with ideological incompatibility are separated from those they cannot tolerate by longer routes.

6. Sit back and let the chips fall where they may. Live in a habitat with people of like mind, eventually die but know that humanity has been given a head start to interstellar colonization and the biospheres of earth have been preserved as redundantly as possible without dismantling any worlds beyond earth.