Why do we spend so much time counting other people's money? Because these moguls have the power to shape our world. Telecom billionaire turned prime minister Najib Mikati is keeping Lebanon's government together. Ernesto Bertarelli, who lost the America's Cup to Larry Ellison last year, is now focusing on saving the oceans from mass extinction. Gates and Buffett have already traveled to three continents working to change giving practices among the ultra-rich.
Where their inspiration leads, we will follow.
A note on methodology:
More than 50 reporters in 13 countries worked on compiling the list this year, valuing individuals' public holdings, private companies, real estate, yachts, art and cash. Net worths were locked in using stock prices and exchange rates from Feb. 14.