Peter Singer, often described as the world’s most influential living philosopher, presents a challenging new movement in the search for an ethical life, one that has emerged from his own work on some of the world’s most pressing problems. Effective altruism involves doing the most good possible. It requires a rigorously unsentimental view of charitable giving, urging that a substantial proportion of our money or time, should be donated to the organisations that will do the most good with those resources, rather than to those that tug the heartstrings. Singer introduces us to an array of remarkable people who are restructuring their lives in accordance with these ideas, and shows how, paradoxically, effective altruism often leads to greater personal fulfilment.