So i'm playing terrans on a whim, of course you made a custom map for earth.
But the placement of tiles on it doesn't really make sense. Europe and all of south america was unuseable.
I think earth needs a more static layout of tiles. Most notably, specific areas should be unuseable but terraformable, including:
Canada
Northern Russia/siberia
All of africa
The middle easy
Australia.
since those places have vast amounts of desert or frozen tundra.