Demographers are worried about overpopulation, but Amazon founder Jeff Bezos wants to populate our solar system. He hopes that in a thousand years' time, a trillion humans would be living in the solar system. He said if that happened, "we would have at any given time 1,000 Mozarts and 1,000 Einsteins.…Space would be full of life and intelligence". He wants to build the infrastructure that space entrepreneurs will use in the future.

Elon Musk agrees with Mr Bezos. He said: "We want to be a multi-planet species." He warned that: "Population collapse due to low birth rates is a bigger risk to civilization than global warming." Bezos said people would live in giant space stations, and would visit Earth for vacations. He thinks Earth's environment will be pristine again because of factories built in space. He said they could get resources from asteroids instead of from Earth.