We humans like to define where we are going by defining where we are. This perspective represents an important problem in natural sciences because when we measure how much an ecosystem or area has changed, we generally compare it with its condition a few years ago. The risk is that each time that this is done, the baseline of our comparison may have drifted further and further away from the original starting point, impairing the true magnitude of past environmental changes. In this book, we present a multidisciplinary work to reconstruct for first time the past upper Gulf of California...