The two stars are part of the new ONE campaign, which hopes to gather an army of people to become aware of the problems in Africa.
Bono, who is on a break from his American tour with group U2 for the launch, commented, "We’re asking for people’s voice… We’re getting a little army together – a million Americans, all ages, all backgrounds; just saying it’s not acceptable what’s going on in Africa. (There are) people dying for no good reasons… We can fix that."
Pitt adds, "I have seen it, I have been there and to walk away from it, turn my back on it makes me culpable, and I cannot do that."