We are confident we gave some idea how the fluid portions of the planet have evolved in more than 4.5 billion years. It is time to ask what are today the conditions of the atmosphere and the oceans while we reserve the last chapter to make some hypotheses on what to expect in the future. The first thing to notice is that for the first time in the history of our planet both the atmosphere and the oceans feel the presence of human activity. We all know the problem related to the emission of greenhouse gases (mainly carbon dioxide) for the atmosphere and the acidification of oceans and rain. We have also mentioned the slow increase in temperature of the surface ocean, the plastic pollution, and so on.