It is only really in the past decade that science has begun to tell us that the man-made changes now occurring in the oceans – from acidification to overfishing to the growth of dead zones – represent some of the greatest threats to life on Earth. There has been a need for a book that sets our current predicament in the context of previous changes in ocean chemistry and periods of extinctions. I was once nearly persuaded to write one. I’m glad I didn’t, for Callum Roberts has clearly done a better job than I would have.

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