Claiming the top spot this year on the Forbes World’s Billionaires list is Mexican telecom titan Carlos Slim Helu and family. They are worth $53.5 billion, up by more than 50% compared with last year’s $35 billion. Helu was ranked third last year. Slipping to third position from second last year is legendary investor Warren Buffet. He is worth $47 billion, an increase of $10 billion over his net worth in 2009.