LOUISVILLE, Ky. (AP) -- National Park Service officials are concerned that a company's plan to send natural gas liquids through an aging natural gas pipeline near Mammoth Cave National Park may pose a threat to the cave's ecological systems. The proposal by Kinder Morgan to convert part of its Tennessee Gas Pipeline Co. operations has stirred controversy all year along a 256-mile path through Kentucky, The Courier-Journal reported (http://cjky.it/1JTLB0y). Bobby Carson, chief of science and resource management for the park, said the 70-year-old... More