Did Neolithic switch to agriculture drive selection for lighter skin colour in Europeans?

Study finds evidence of strong positive selection for skin, eye and hair pigmentation over last 5,000 years.

Why do people living in the tropics have dark skin whereas those living in higher latitudes have lighter skin? The traditional explanation is that is an evolutionary balancing trick between protection from skin cancer on one hand and the synthesis of Vitamin D by skin cells on the other. Dark skin results from higher levels of the pigment melanin: for those living nearer the equator, higher melanin levels provides a better protection from the sun’s more intense UV radiation; conversely, for those living at latitudes where UV radiation is weaker, the protection is not required and high melanin levels would block the production of Vitamin D.
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