With nearly 12 million vehicles around the world running on compressed natural gas these days, but only 120,000 of them in the U.S., opportunity looms in a country that is weary of expensive crude oil from increasingly unfriendly nations and home to a vast supply of natural gas. “Without question, natural gas will allow our country to transition our transportation system away from expensive and carbon-heavy gasoline and diesel towards carbon-light, affordable American produced natural gas,” says Aubrey K. McClendon, CEO of Chesapeake Energy. McClendon’s company, the second-largest natural gas producer in the country, is trumpeting the discovery in the...