U.S. oil and gas prices are lower than shale producers would like right now, but famed Dallas energy financier T. Boone Pickens told a Houston audience that he sees the American energy boom continuing for many years to come and maybe another three decades or so. Pickens, who spoke at a panel with former Houston Mayor Bill White and others, said the oil and gas industry should receive more credit for the improving U.S. economy that has helped to stabilize global energy prices.