So basically we need to get into space to

- Create O'Neill cylinders whose only purpose will be farming of food. Ideally automated function with minimal crew which can have complete control over the environment so no pesticides needed by design and can be on the sun 24/7 to achieve maximal efficiency in growing crops.

- Mine minerals from asteroids to avoid gravity wells. This will solve dependency on random dictators controlling resources (Russia), accusation of neocolonialism (Africa) and avoid destruction of untouched nature (Ocean floor, Antarctica)

- Move heavy and polluting industry out of Earth and closer to primary inputs from meteorites. This will resolve out of control emissions which will be growing as population in 3rd world countries will get as rich as Western countries.

- Build a satellite swarm shade in front of Earth to reduce amount of sunrays falling onto the Earth and to prevent runway climate change. This can have also triple use as such shade structure can produce electricity in practically unlimited amount and concentrate this electricity into a beam aimed at a collector on Earth / industrial station on orbit or use it as a weapon by aiming such beam onto a target.