I have my region called BEP (Bichel Ecology Project)
Which is supposed to be a very clean city close to my vision of a clean and ecologic real world.
It is going quite well, but i lack a varity of environmental friendly buildings. What i lack most is ecological farms that doesnt use chemicals and unlike the one ingame have no waterpollution.
Wnother thing is self supplying houses whit solar panels connected to a fuelcell, or perhaps a heatpump like the ones in schweden that takes advanage of the earths heat even though the earth is frosen.
Then i would like a mod that would ad non polluting cars, that would most likely be hydrogencars driven by fuelcells or like the one they just invented in france that drives on airpressure.