San Diegno Union-Tribune: Texas billionaire T. Boone Pickens became one of the world’s richest people by drilling for petroleum. But these days, he’s spearheading a multimillion-dollar push to wean the nation from oil and onto wind power and natural gas. T. Boone Pickens Personal: Born May 22, 1928, in Holdenville, Okla. With a $3 billion net worth, Pickens is the 117th-richest person in the United States and 369th-richest in the world, according to Forbes magazine. Pickens’ wife, Madeleine, …