With his epic Pulitzer Prize-winning 2018 novel The Overstory, Richard Powers earned acclaim for his rumination on the connected lives of trees, and the threats they face. In his latest novel, Playground, he explores what humans can learn from the underwater world that can seem so alien to us here on land. Powers joins Piya Chattopadhyay to discuss its themes of climate change, technological instability and the power of awe... and why he's trying to tell a more hopeful story about the existential threats facing us today.