Recent research on climate conditions in the Cretaceous entered an exciting, multidisciplinary phase, in which geological, sedimentological, geochemical, mineralogical and paleontological approaches were integrated, and a better view of the climate change evolution during the warming intervals was achieved. The project’s theme thus became part of the current research on global warming. The extreme heat of certain Cretaceous intervals represented one of the best examples of “greenhouse” climate conditions in the geological record. The results of multidisciplinary studies (sedimentological, paleontological and geochemical) in the project provided answers to many of the questions in the field and were also related to the current concerns.  Due to the complete geological evidence from the Cretaceous stage and their paleontological wealth, the Carpathians in Romania perfectly served as „natural laboratory” for this topic.