The asteroid belt has enough metal to build cities in orbit it do the dirty things that now pollute the earth.
First we need a space elevator
en.wikipedia.org...
We can use the carbon from CO2 to make the nanotubes to build it.
Once we have the space elevator we can build a small space city at the top of it and use it as a staging ground to go to the moons of Jupiter and the
asteroid belt for hydrocarbons and iron and other metals and gasses.
we can also use microwaves to beam energy from power satellites to the space elevators and down to earth with super conducting power cables
Once we are going that far out we can also hijack comets and crash them into mars, this will build up a atmosphere on mars plus more water.
add some methane from the moons of jupiter and CO2 from earth (we can replace it with O2 from the solar furnaces gases) and start a green house effect
on mars and you then have a planet that can support life.
add a space elevator on mars and now you have two planets for man.
Then take more asteroids and with a ring of space solar furnaces
en.wikipedia.org...
To build space habitats
en.wikipedia.org...
These can be built around the moon and moved with solar sails anywhere they are wanted.
en.wikipedia.org...
For the atmosphere in the habitat the gases from the refining of the asteroids can be cryogenicly separated and used to fill the habitats
Whats left why use natural resources from other planets when the moon, the asteroid belt, comets, and the moons of Jupiter, can supply all we will
need for 1000s of years
after that it is up to the imagination,
warp drive
transporters (beam me up Scotty)
family space craft
space prospectors.
asteroid farms.
clear glass space homes.
put a space shade in front of Venus to cool it down and we can move there too.
move mercury out of orbit and put it in orbit around mars.
mine the rings of Saturn.
mine the kuiper belt.
en.wikipedia.org...
or maybe the Oort cloud
earth first we will mine the other planets later.
[edit on 30-10-2008 by ANNED]
[edit on 30-10-2008 by ANNED]