When a member of your household feels unwell, a good first step is to find the thermometer -- if there's a fever, it could be something serious. Well, these days our planet is exhibiting signs of illness, from swarms of locusts in East Africa and southwest Asia, to the smoke spreading from California's infernos, to a massive release of greenhouse gasses from once-frozen, now-burning Siberia. And Covid itself may serve as both a metaphor and an exemplar of the inextricable connection between the planet's health and that of our species. This week on Sea Change Radio, we speak to Howard Frumkin, a physician and environmentalist who recently coauthored a book entitled Planetary Health: Protecting Nature to Protect Ourselves. We talk about how the pandemic exposes planetary health issues related to food, population, and politics, and touch on what we can do to bring the patient's fever down.