Rather than looking at the prospect of terraforming Mars, I suggest you look at Venus. (legalinsurrection.com)
Living in a 250 sq ft tiny home would be downsizing enough for most people, but Richard Ward of Terraform Tiny Homes from Dallas, Texas recently traded in this «mansion», as he calls it, for -LSB-...] (jetsongreen.com)
That old knowledge has been forgotten but is found as a residual assumptions in various locations such as the NASA work on terraforming Mars which relies on a more massive atmosphere to raise surface temperatures rather than more GHGs. (wattsupwiththat.com)