It doesn't sound like they are entirely sure that sunscreen concentrations in sea water is a direct cause yet, just a possibility. Also, it seems that some of the ingredients listed that may cause the problem (they are not sure which one it is) are also some that can be harmful to us as well (parabens for example). Many natural or mineral sunscreens don't actually contain those ingredients because they have been shown to be potentially harmful. I looked up the ingredients list on the current sunscreen I use from Alba Botanical, and none of the ingredients that may cause coral bleaching were present in that natural sunscreen.
So it is also an option for people to use natural or mineral sunscreens - both because they seem to not contain the ingredients that may cause the coral problems, and because they also remove ingredients that may be harmful to us as well.
I just learned today that the sun screen that people wear to the beach is killing the coral reefs. I've been wearing sunscreen for years! Luckily our skin does have a natural way to protect itself if we take in the sun gradually. Or we could wear hats and long sleeves more often. The coral reefs are worth it don't you think? news.nationalgeographic.com/news/200 8/ 01/080129-sunscreen-coral.html
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