Every year for Earth Day, we talk about the earth with writer and photographerStephen Trimble, author of “Bargaining for Eden: The Fight for the Last Open Spaces in America,” and many other books. This time, we’ll also be talking to retired Westminster professor David Stanley and former National Park Service naturalist and planner Greer Chesher. All are editors of books in the ongoingNational Park Reader Series published by University of Utah Press. We’ll explore the literature surrounding the national parks and talk about overcrowding, crumbling infrastructure, national park policy and much more.