We humans are the ultimate invasive species, transforming the planet in dramatic and surprising ways. In his work as a Princeton University biologist and host of the PBS series “Human Footprint,” Shane Campbell-Staton explores the biological impact humans have on the Earth and how nature is forced to adapt. He joins us to talk about the ways we are changing the world’s ecosystems, our inextricable connection to the plants and animals around us, and what this tells us about our own species.