The Crescents are descended from Hispanic/African American refugees and Chinese settlers, so the majority of Crescents have a carmel skin tone, although light skin isn't entirely uncommon. As for the Terrans, statistically speaking, the majority are light-skinned asians of Chinese origin, with the darker-skinned Indians following close behind. Europeans didn't undergo any race purges, per se; they were simply overrun with immigrants from the Middle East. The majority of Europeans are still light-skinned, albeit very different now culturally. The biggest demographic changes were in the Americas, where light-skinned people were all but eliminated.

I'll locate a more realistic image for Ed for you soon, sure.