Over his long career as witness to an extreme twentieth century, National Book Award-winning psychiatrist, historian, and public intellectual Robert Jay Lifton has grappled with the profound effects of nuclear war, terrorism, and genocide. Now he shifts to climate change, which, he writes, 'presents us with what may be the most demanding and unique psychological task ever required of humankind,' what he describes as the task of mobilising our imaginative resources toward climate sanity. A profound, hopeful, and timely call for an emerging new collective consciousness to combat climate change.