I find it incredibly odd that we have not evolved to withstand things that have been around since before we where. Evolution is supposed to allow the survival of the most adapted through mutation and natural selection. So why do we need sun block?
Recent scientific press releases suggest that the Sun's power output is not increasing and so is not a contributing factor to global warming. If this is the case, why have our bodys not evolved mechanisms for coping with a phenomenon that we have always lived with? Shouldn't we have developed the ability to withstand any damage the sun does to us naturally? Life could survive outside of the protective oceans early in it's history partly because UV radiation from the sun would have broken down the protiens it contained and killed it. The sea provided a natural defence against this happening. When it evolved a certain level of protection, life was able to flourish on dry land. So we do know that life can evolve protection but why hasn't it developed sufficiently to fully protect us. Perhaps there is an evolutionary advantage in not doing so. I believe that populations in hotter regions have better protection (perhaps those living in equatorial latitudes), but surely, it is enough of a hazard that all living creatures should have developed protection. Which lead on to thinking about if Animals suffer from skin damage due to sun exposure. After all, they are out in the open more often then Humans, with less protection and they don't wear sun cream!
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