The polluted water is really genius.
Pollution really has no effect on game appearance right now; the decaying trees are barely noticeable anyways and they typically get cleared out soonish anyway. Having that green dirty water near your powerplants will surely make a difference.
One small gripe I always had with the game is that there's no incentive in playing "green"; even in deathworld the solution is not less pollution but more firepower.
Krastorio, with its air filtering, actually gave me enough of an excuse to go green that for the first time in my life I had efficiency modules in beacons - not to save power (beacons eat too much of that) but to save pollution.