Warren Buffett loves this oil and gas giant. You should, too.Looking for profitable energy stocks? Check out what Warren Buffett owns. He's been a major energy investor for decades, investing in a wide range of verticals, everything from upstream and refining to large scale renewable projects. Currently, the fifth-largest position in his publicly traded portfolio is an energy company everyone has heard of -- and there's a great investment case to be made for it right now. Secure a reliable 5%-plus sharehold ...