At 91-years-old, Jane Goodall hasn't just seen a lot of change in the world – she's made a lot of change. The legendary naturalist’s field work with chimpanzees transformed how both science and the general public view our fellow primates. In later years, as an activist and conservationist, she’s inspired countless young people to follow her lead and change the world. Today, when political leaders seem to be prioritizing the economy over the environment, Goodall speaks with Piya Chattopadhyay about how to stay hopeful, and to keep on sparking positive change.