In 1989, the environmental activist Bill McKibben wrote a bestseller called “The End of Nature.” It painted an apocalyptic picture of the state of the planet. Nearly three decades later, we take a look at a book of essays by the generation that grew up after McKibben laid out his vision. “They’re the first generation that learned the mantra Reduce, Reuse, Recycle from Sesame Street. They’re the first generation to see really tangible evidence of changes in the environment from garbage islands floating to ice caps melting,” says Susan Cohen, co-editor of “Coming of Age at the End of Nature: A Generation Faces Living on a Changed Planet.” She joins us, along with two young writers who contributed essays to the book, James Orbesen and Emily Schosid.