Your question got me thinking and I looked at the Bacon mod's change to the terraforming tech. The Bacon mod readme notes state: "Terraforming: The terraforming facility (#9 in Facilities.txt) now has its second and third values used to raise a planet’s habitability rating. Previously they were zero. The second value is the rate of terraforming and the third value is the limit to which habitability can be raised. Default values are 500 and 80." I play my own modded version of RetreatUE. Both Retreat and Bacon have identical lines the Facilities text for Terraforming. The only diference is Bacon has changed the second zero to 500, and the third to 80. Last evening I changed my version of Retreat to 500 and 80. The game did load and start, but it was too late to play. I will test to see if it works, but don't expect any results soon. I'm simply playing the game, not specifically testing this single asspect. Depending on how much time real life allows me, it will take a while before I advance enough in the game to be able to research Terraforming and aply it. Happy gaming!
I once heard there was a garage, which some said was air tight.