China retaliated Monday morning with a new round of tariffs against the U.S. as the trade war between the two countries heats up. NPR's Jim Zarroli joins Here & Now's Robin Young to discuss the latest. Also, author David Wallace-Wells' new book, "The Uninhabitable Earth," looks at the catastrophic consequences global warming is already having on the planet. And, a man was arrested this weekend in the killing of a hiker along the Appalachian Trail. That and more, in hour one of Here & Now's May 13, 2019 full broadcast.