Amy is joined by American biologist Professor David George Haskell who talks about his new book on the evolution of sound and the beauty of listening in nature. David also shares how humans are now silencing and smothering many of the natural sounds of the living Earth. It's a crisis that is easily solvable with political will. David G. Haskell is a professor of biology and environmental studies at Sewanee: the University of the South. His latest book is called, Sounds Wild and Broken: Sonic Marvels, Evolution's Creativity and the Crisis of Sensory Extinction.