The full title is Blue Machine: How the Ocean Shapes Our World. This is a fascinating book about how the ocean works. Temperature, density, salt content—all play a part in determining what lives where, the weather, and much more. The ocean has a huge influence on human life, though this is not widely recognized. Years ago, I heard Jacques Cousteau say that human civilization could not survive the death of the oceans. This book provides more background on that statement. Highly recommended.