Hi all,
This is a cool site I have been visiting for a while and now feel comfortable enough to post to. This is also a very interesting conversation. Here are a few thoughts I have had.
Problem: Lack of "hot" core for Mars.
Possible Solution: Ram a large asteroid into Mars.
Problem with solution: We have to wait a few hundred thousand to a million years for it to cool enough to let us visit it. That's a little outside the window of planning for the human race.
Problem: Lack of breathable, high density atmosphere
Possible Solution: Find a comet (or multiple comets) that is (are) high in Nitrogen, Oxygen and any other elements we might want and alter their trajectories so they slam into Mars.
Problem with solution: We may have to wait a few hundred years for the planet to be free of the dust cloud the impacts would cause.
Another solution: Genetically modify bacteria found on Earth to survive on Mars and produce bacteria.
Problem with solution: Takes a reaaaalllyyy long time to generate an atmosphere that way.
Problem: Mars Gravity is not that of Earth (approx. 1/3 of Earth's), which is a partial reason for the low atmosphere, so what effect will this have on the Human Species?
Possible Solution: The same solution to the hot core problem.
Problem with solution: Same time frame as the hot core problem.
Finally, here is an interesting site about Mars.
http://mars.jpl.nasa.gov/mep/science/