The natural gas drilling method known as fracking is igniting controversy in states from Pennsylvania to Wyoming. Fracking is going on in Tennessee, too, and that has environmentalists concerned. This hour of Dialogue is dedicated to learning about the pros and cons of fracking in Tennessee. In the first portion of Dialogue, we hear from Dr. Kevin Hoyt of the University of Tennessee. He's heading up the university's efforts to study fracking on the Cumberland Plateau. In the second portion of the program, we're joined by environmental lawyer Gwen Parker and Mike Williams, Executive Director of the Tennessee Petroleum Council.