8 Celebrities on the Charities Closest to Their Hearts

Matt Damon - Water.org

"Several years ago, while traveling in Zambia, I met a young girl who told me that she was going to move to a city and become a nurse. I realized that if someone hadn't set up a well near her home, she would have spent her life scavenging for water—but with access to that well, she was able to attend school and plan for her future. With Water.org, I want to raise consciousness about the magnitude of this challenge—and its solutions."

How you can help: You can spread the word on Facebook or Twitter, shop for gifts that support Water.org's work, join a community of athletes committed to the cause, or simply donate.