Just wanting to make sure that everyone realizes that terraforming Mars isn't a months long, or even years long process... it's decades long Your great grandchildren may be ble to run across bluish grass fields and laugh and scream without resperators and chemical suits.<br/><br/>For that matter, the second or third generation of Martians will as likely as not be taller, and more finely boned than their Earthling cousins due to the lower gravity. Their eyes will likely see better in low light as Mars doesn't get but a portion of the sun's radiance during the day.. going back to earth may be impossible for them as their muscular and bone structure may not support them in Earth's higher gravity.<br/><br/>Just putting some thoughts out there. Thickening the atmosphere will reduce the severity of sand storms, and allow for the formation of "grasses" that will feed off of the current gas mixtures. The iron rust of the ground soil will also give you a rather nice blue color to plantlife and flowering plants (Much like planting an iron nail under a plant, or a fish under it will cause flower colors to change).<br/><br/>It's a fasenating process.