With Humanity out of the way, a fleet of specialized robots descended onto Planet Earth. Shaped like spiders, they excavated landfills and sent the rubbish for proper disposal using much more advanced technology. They demolished concrete cities and restored the original vegetation.
Landing near the defunct nuclear power plants and storage facilities, spaceships loaded barrels of radioactive waste into their cargo holds for incineration by the sun. It was simply too risky to leave these poisons on the planet.
In the ocean, fleets of white robotic craft began work. The slender ships in front dredged the oceans for rubbish and waste materials. The round ships behind purified the ocean waters.
The work extended into space, where satellites diverted solar energy both to prevent reduce the effects of global warming and to the promote growth of plants in badly damaged areas.
The restoration work took another two decades to complete. The World Government then declared Planet Earth a Natural Reserve where the use of technology is banned; only emergency medical, transportation and communications technology was permitted.
The peoples who desired to live without technology returned and restarted the tribes and cultures of their ancestors. Tibetans, dressed in their traditional robes, inhabited a bustling Potala Palace. American Indians hunted deer on their ancestral lands. The Great Wall of China stood silently, watching over the nomadic tribes.
One day, a half-naked dark-skinned teenage boy walked into a village filled with many stone walls. Newly initiated to adult status, he was draped with white war paint in a zig-zag pattern and many red dots. He came upon the scared altar where he cast a stone onto the wall and sang the prayer of the Star People. He waited. Within minutes, a small, white spaceship hovers silently above him to take him to visit the the people living among the Stars.
An altar allowing space communications stood in the ceremonial centers of every town and village. When children come of age, their guardians bring them to this alter to decide whether they wish to remain on Earth or to go to Space. Every adult has the opportunity to visit or live in any community on Earth or in Space, subject to the community’s approval. A fleet of automated, self-maintaining space shuttles ferried visitors and migrants on demand between Earth and all space cities within the Solar System at no cost.