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18. Matt Damon
Actor Matt Damon is on a mission to bring clean water to Africa, and his efforts should be applauded. He co-founded Water.org in 2009 to promote safe water initiatives and clean lavatory facilities in Africa –– something we as Americans take hugely for granted, as Damon points out on his site with the disarming fact that in today's world, more people have access to a cell phone than a toilet.