Treatise on Geochemistry, Third Edition, 6 volume set is an invaluable resource for geoscientists and others seeking to understand the origin, evolution, and functioning of our inhabited world, in service of a sustainable future. Our need to understand our planet is being reshaped by two ongoing scientific revolutions: the discovery of thousands of exoplanets and the advent of the Anthropocene. These seemingly disparate revolutions challenge us to deepen our understanding of Earth, as our best path to understanding how inhabited planets work. Geochemical knowledge and discovery are at the heart of this challenge, the crossroads where all geoscience subdisciplines meet - much as chemistry is often said to be the "central science", geochemistry is the "central geoscience".