Yes.  The song "Where the Streets Have No Name" is all about Bono's experiences in Ethiopia and how he felt like no one was paying any attention to the starvation there.\n\nAlso, Crumbs from your Table on U2's latest album, how to dismantle an atomic bomb, is about how an enormous economy like the US could help out poverty stricken countries with just a few "crumbs from their table" (i.e. just a small amount of money in the big scheme of things)