ET Exclusive The Good Shepherd – Damon and Jolie

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Which do you think Matt Damon cares more about?

1) Clean water in Africa
2) or…the PUBLICITY he gets from saying he is for clean water in Africa

Matt Damon went to the Sahara Desert to scout locations for a movie about long-distance runners. But when he got there, he took on another project: helping bring clean water to Africa.

Damon and the production team behind the upcoming documentary "Running the Sahara" created a charity to accompany their filmmaking expedition in Africa, which gets under way this month.

During his preliminary visit to the continent, Damon, 36, said he "saw firsthand the effects of one of the largest public health issues of our time – the world water crisis which is at its worst in Africa."

Matt Damon is one of the very first CIA agents in this real-life thriller directed by Robert DeNiro about the birth of the U.S.’s most secretive organization.