A U.S. energy revolution is underway as the country takes advantage of its abundant natural gas supplies. Here are some investment ideas.
"The shale gas that we found in this country has given us an enormous competitive advantage that will last for a number of years," Kent Croft, Croft Funds chief investment officer, told CNBC. "There are some companies that you can in and buy into at very reasonable valuations and hold for a very long time as part of a long-term portfolio."