We stand at a precipice - a point where the future is at stake. This book is a clear-eyed look at the risks that we face, from the familiar, such as nuclear war and climate change, to the emerging, such as biotechnology and advanced artificial intelligence. It argues that ending these risks has become one of the most important moral issues of our time. This is an inspiring vision of human history, the legacy we will leave behind, and the steps we must take to work towards a brighter future. From one the world's most cutting-edge young philosphers.