Giving Pledge Signers Gave Big in 2013 but Not Much for Today's Needs

More than 120 of the world’s billionaires have committed publicly to giving at least half their wealth to charity, including 19 on this year’s Philanthropy 50 list. But while the number of people who have signed the Giving Pledge has been growing, so too are concerns about whether the effort is channeling enough new money to urgent causes today and whether some people are motivated to join for public-relations purposes.