'A monumental event. William MacAskill is one of the most important philosophers alive today, and this is his magnum opus.' Rutger Bregman, author of Humankind'A book of great daring, clarity, insight and imagination. To be simultaneously so realistic and so optimistic, and always so damned readable...

well that is a miracle for which he should be greatly applauded.' Stephen FryHumanity is in its infancy. Our future could last for millions of years - or it could end tomorrow. Astonishing numbers of people could lead lives of great happiness or unimaginable...