The world’s appetite for transcendence is endangering the very organisms that once mediated it. From the Sonoran Desert to the Amazon Basin, plants and animals that produce psychedelic compounds—peyote, ayahuasca vine, iboga, and even a toxin-oozing toad—are under pressure. As psychedelic therapies move from ritual to clinic, their biological sources are succumbing to overharvesting, habitat […]