How would you react if you knew that 30 days after your death, the Earth and all life on it would be irretrievably destroyed? Would this knowledge influence the way you live your life? This is the thought experiment that American philosopher Samuel Scheffler invites us to consider in his fascinating book. He demonstrates that such knowledge would have far-reaching consequences for our lives—nothing would be the same again! In equally lucid and psychologically astonishing analyses, which repeatedly draw on brilliant examples from popular culture, Scheffler shows that this knowledge of humanity's impending doom would call into question the value of many of our activities: long-term medical research for a cancer treatment would lose its meaning, as would the fight against climate change or efforts for international cooperation.