water:

http://india.blogs.nytimes.com/2013/08/29/matt-damon-tries-to-get-clean-water-and-toilets-for-indias-poor/#postComment

Matt Damon finds it a challenge to get people to care about water. It’s why he was in India from Aug. 23 to 26 on a four-day tour. Not to promote his latest film Elysium, a sci-fi dystopia with a socialist underpinning, but to help the rural and urban poor in India get access to clean water and sanitation by investing in tube wells, hand pumps and toilets with proper drainage facilities.