A framework to guide planetary health education. Issue 5 (May 2021) - Guzmán, Carlos A Faerron; Aguirre, A Alonso; Astle, Barbara; Barros, Enrique; Bayles, Brett; Chimbari, Moses; El-Abbadi, Naglaa; Evert, Jessica; Hackett, Finola; Howard, Courtney; Jennings, Jonathan; Krzyzek, Amy; et al.