The new scientific climate history is about more than just the history of climate. It is developing in a new climate of history; it forms one of several leading edges in archaeoscience, the broader transdisciplinary convergence that brings the power of science to bear on the human past. Along with the emergence of archaeogenetics, biomolecular archaeology, and digital humanities—such as geographical information systems ( gis ) and computational philology (quantitative studies of textual authorship)—climate history is in the process of achieving the long-imagined re-unification of the sciences and the humanities as it unveils historical changes in the environment.

The integration of high-resolution archaeological, textual, and environmental data with longer-term, low-resolution data affords greater precision in identifying some of the causal relationships underlying societal change. Regional and microregional case studies about the Byzantine world—in particular, Anatolia, which for several centuries was the heart of that world—reveal many of the difficulties that researchers face when attempting to assess the influence of environmental factors on human society. The Anatolian case challenges a number of assumptions about the impact of climatic factors on socio-political organization and medium-term historical evolution, highlighting the importance of further collaboration between historians, archaeologists, and climate scientists.

Growing scientific evidence from modern climate science is loaded with implications for the environmental history of the Roman Empire and its successor societies. The written and archaeological evidence, although richer than commonly realized, is unevenly distributed over time and space. A first synthesis of what the written records and multiple natural archives (multi-proxy data) indicate about climate change and variability across western Eurasia from c. 100 b.c. to 800 a.d. confirms that the Roman Empire rose during a period of stable and favorable climatic conditions, which deteriorated during the Empire's third-century crisis. A second, briefer period of favorable conditions coincided with the Empire's recovery in the fourth century; regional differences in climate conditions parallel the diverging fates of the eastern and western Empires in subsequent centuries. Climate conditions beyond the Empire's boundaries also played an important role by affecting food production in the Nile valley, and by encouraging two major migrations and invasions of pastoral peoples from Central Asia.

Consilience refers to the quality of investigations that draw conclusions from forms of evidence that are epistemologically distinct. The term seems particularly apt for conclusions produced by natural-scientific investigations on the one hand and by historical and archaeological studies on the other. Consilience points to areas of underlying unity of humanistic and scientific investigation— a unity arising from that of reality itself; it represents a convergence in parallel but independent investigations that results in deductions that are much more robust than any investigation would be able to produce on its own.

During the last twenty years, archaeozoological research has significantly transformed the picture of the black rat ( rattus rattus ) in classical antiquity and medieval Europe. These new data, in conjunction with extant texts from these periods, make a great contribution to the understanding of the bubonic plagues of the sixth and the fourteenth centuries, as well as to the history of the communications and economic systems linking the Mediterranean to the Indian Ocean and the Atlantic. The study of ancient rats and their colonization extends the temporal and geographical groundwork for a fully historical global ecology.