Billionaires in big charity pledge

NEW YORK: Dozens of US billionaires pledged to give at least 50 percent of their fortunes to charity as part of a philanthropic campaign by two of the world’s richest men — Warren Buffett and Bill Gates.Based on Forbes magazine’s estimates of the billionaires’ wealth, at least $150bn could be given away.Among the rich joining The Giving Pledge campaign are New York Mayor Michael Bloomberg, media moguls Barry Diller and Ted Turner, Oracle...