[JimMorrison]

Okay, results of the second test coming in now, to see the synergy of point spending. I did all 3 nations again, but Oceania got the Heat and Atlantis got the Cold this time. Everyone got 3 Order + 3 Growth (just checking straight income potential, not exploring other options for the points), and Oceania and Atlantis used their temp scales to buy 3 Prod as well (R'lyeh has 1 Prod). All 3 have a statue with Dom 5 to simplify that aspect.

Oceania - 3 Heat - 30010 pop - 902 supplies - 447 income = 67.1 pop/gold
R'lyeh - Even - 30360 pop - 1260 supplies - 434 income = 69.9 pop/gold
Atlantis - 3 Cold - 29940 pop - 980 supplies - 485 income = 61.7 pop/gold


The numbers still seem to imply an income boost of about 3% per Cold scale, underwater, at least for aquatic nations. That's not confirmed by me with R'lyeh specifically, but if it's true with both the others.....