The Starter Footprints in Port Promise and Grims Quarry are a little bit fake. I 've tested it with a fresh new game after I was a little bit astonished, how the lots in Grims Quarry can be green without any green content in the house. And indeed, if I choose the one houshold in Grims Quarry for activ playing it startet to run down to neutral. The overview for the world show also at once neutral. That's the reel footprint of this house. Then I 've made a short journey on every lot of these both neighboorhood. Nearly all lots became neutral. Only one in Port Promise - the empty lot - is still industriell. The neighborhoods have still the starter footprint of green and industriell.
I have understood, that the footprint is two sides counting: The lots charakter and the neigboorhods charakter. Living in a (in reality neutral) lot in Grims Quarry will run down your green footprint in a quick way, if you do not any green things for it. Only the green starter footprint of the neighboorhod will stop this a little bit. The contrary happens in Port Promise, if you choose a faked industriell houshold for playing. Only the real industriel lot will show an other behavier, but it is surrounded of neutral lots. I think, they gave a little bit real different Footprint for the start, so you have a better chance for staying green in Grims Quarry ... an easyer chance to become green in Port Promise, but feel a little bit industriell in the beginning - for a little bit gameplay.
Every one can reproduce the real footprints in the lots in a starter game: only make a jump to the left in Grims Quary and the a step to the right in Port Promise through all the lots.