Exposure to sun gives your skin a tan, not a color! Do you know all the human race descends from a single black South African mother. During the course of time genetic mutations and cross hybridisation resulted in changes in facial features, color of skin etc. Environment had no role in it. That hypothesis was thrown out by scientists decades ago. Chanakaya, prime minister to Ashoka of Magadh was a dark-skinned brahmin, while his other minister Rakshash was fair-skinned. The colour of skin is in the genes and not related to environment or profession. My cleaning lady is fairly dark but her son is as fair as any gora.
