The Dutch soil contains much hidden information about the history of our country, the former habitation and all kinds of natural changes that have taken place. With paleoecology we try to read those stories of the substrate through a variety of analyzes to the sediments; from bottom to top a representation of the environment over time. The upper layers in the subsurface still resemble the world around us, but the fossils deep in the ground of millions of years ago show us a world with higher temperatures, high CO2 levels and vast swamp forests. This world is difficult to simulate with climate models, therefore indicating that the future is very difficult to predict.