>>Are they working on generating atmosphere on Mars and the Moon?
No, not to my knowledge.
>>Or are they simply habitation domes with wildlife exported to the habitable zones?
only domes are the inflatable surface ones, usually pool decks, part of
some resort. Most of the habitats are underground as dirt is cheap
shielding from radiation. On luna they had to dig it all out but on
Mars they just sealed up lava tubes. I've seen pictures of a guy
walking barefoot in a Martian lava tube, no spacesuit or anything. He
was holding a handful of rocks covered in lichen....growing on martian
rocks. And the dude was breathing with no space suit. Blew my fucking
mind, and made me wonder what sort of flora and fauna they could set up
if they found or created a suitably large cavern. Sealing it so as to
minimize air loss would be a bitch though.
>>Also, how do you generate the sort of energy to make spaceflight affordable?
elevator, one built by Virgin-Bigelow and the other in construction
right now by NASA. The travel between luna and mars is provided by
Virgin Bigelow in the form of ferries, basically thin metal
superstructures in space like a bridge or something built out of
erector set. Can be any shape they like, the purpose is to have lots of
hard points to attach tanks for fuel, water, air, food, cargo, whatever
is needed. On one end there's a nuclear pulse drive and the impact
plate, and on the other end is the crew compartment. Virgin Bigelow has
a fleet of five, NASA has only two.