Once you have enough infrastructure in orbit you can start to recycle (kinetic) energy, reducing the need for fuel significantly. https://en.wikipedia.org/wiki

Once you have enough infrastructure in orbit you can start to recycle (kinetic) energy, reducing the need for fuel significantly. https://en.wikipedia.org/wiki/Skyhook_(structure) https://en.wikipedia.org/wiki/Skyhook_(structure) https://en.wikipedia.org/wiki/Space_tether https://en.wikipedia.org/wiki/Space_tether Also some fuels could be made away from the earth, making their transport easier as there would be less gravity and atmosphere to fight against (∆v would still be a thing of course). https://en.wikipedia.org/wiki/Propellant_depot https://en.wikipedia.org/wiki/Propellant_depot https://en.wikipedia.org/wiki/Asteroid_mining https://en.wikipedia.org/wiki/Asteroid_mining