Very often we are uncertain about what we ought, morally, to do. We do not know how to weigh the interests of animals against humans, how strong our duties are to improve the lives of distant strangers, or how to think about the ethics of bringing new people into existence. But we still need to act. So how should we make decisions in the face of such uncertainty?

Moral Uncertainty, a new book by William MacAskill, Krister Bykvist & Toby Ord, tackles this question. It is an academic book, and might be especially interesting for philosophers, psychologists & economists.

It’s open-access: you can download the book as a free PDF here, or order a hard copy via Amazon UK. The book is due to come out in the USA in November.




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Here’s an informal history and summary, in tweet form.

Now a thread from Toby Ord:

What is moral uncertainty?

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