I don't think there's a Good ending, actually, it seems there's only one ending. Spent some time trying to balance everything out, and I got down to 0 Co2, decreasing PPM, but (somehow???) increasing temp. At that point I just gave up and went through to buy the eco dome, while the temp was increasing, and it gave the snowing ending. Interestingly, it seems the change in Co2 is *not* the Difference stat you're given, it's Difference - Absorbed, effectively doubling your absorption? This makes it a bit weird to balance, it was fun though!
