Getty ImagesBill Gates addresses a press conference in Brussels.When will the world see its first trillionaire? A British charity estimates that it could happen within 25 years and that it will be none other than Microsoft founder Bill Gates.Oxfam, the U.K. world hunger organization, meant to shame the world's richest with its list of multi-billionaires. Which is odd, considering that Gates is a founder, with Warren Buffett, of The Giving Pledge and has spent billions through his foundation fighting tropical disease and hunger.No matter. The news media blew right by the wealth concentration story and focused instead on the idea of one person on the planet controlling $1 trillion, even if he expects to give at least half or more of it away before dying, as The Giving Pledge requires.via