Apparently, sunscreen is ruining coral reefs. If we covered up more when we went to the beach, we wouldn't use as much and it wouldn't get into the water.
http://dsc.discovery.com/news/2008/05/23/coral-reefs-sunscreen.htmlAlso, a chemical in sunscreen might cause some fish to go to the other gender. Chemical sunscreen is causing transgender fish.
You might want to know this if you are interested in being 'green'. I'm not, but this topic might make you feel better for covering up. Not only are you saving yourself from unwanted stares, you are saving the environment!