For overviews, I recommend: Preventing Human Extinction by Beckstead, Wage and Singer Existential Risk as a Global Priority by Bostrom Reducing the Risk of Human Extinction by Matheny GCR Survey by Sandberg and Bostrom
For book-length detail, Global Catastrophic Risks by Bostrom and Cikovic is good. Others, that I haven’t read, are Our Final Hour by Martin Rees and Catastrophe: Risk and Response by Richard Posner
For overviews, I recommend: Preventing Human Extinction by Beckstead, Wage and Singer Existential Risk as a Global Priority by Bostrom Reducing the Risk of Human Extinction by Matheny GCR Survey by Sandberg and Bostrom
For book-length detail, Global Catastrophic Risks by Bostrom and Cikovic is good. Others, that I haven’t read, are Our Final Hour by Martin Rees and Catastrophe: Risk and Response by Richard Posner