Holocene climatic change and past Irish societal response

The extent to which North Atlantic Holocene climatic perturbations influenced past human societies is an area of considerable uncertainty and fierce debate. Ireland is ideally placed to help resolve this issue, being occupied for over 9000 yr and located on the eastern Atlantic seaboard, a region dominated by westerly airflow. Irish bog and lake tree populations provide unambiguous evidence of major shifts in surface moisture through the Holocene similar to cycles recorded in the marine realm of the North Atlantic, indicating significant changes in the latitude and intensity of zonal atmospheric circulation across the region. To test for human response to these cycles we summed the probabilities of 465 radiocarbon ages obtained from Irish archaeological contexts and observe enhanced archaeological visibility during periods of sustained wet conditions. These results suggest either increasing density of human populations in key, often defensive locations, and/or the development of subsistence strategies to overcome changing conditions, the latter recently proposed as a significant factor in avoiding societal collapse. Regardless, we demonstrate environmental change is a significantly more important factor in influencing human activity in the landscape than has hitherto been acknowledged.     

Climate change,environmental degradation and armed conflict

Climate change is expected to bring about major change in freshwater availability, the productive capacity of soils, and in patterns of human settlement. However, considerable uncertainties exist with regard to the extent and geographical distribution of these changes. Predicting scenarios for how climate-related environmental change may influence human societies and political systems necessarily involves an even higher degree of uncertainty. The direst predictions about the impacts of global warming warn about greatly increased risks of violent conflict over increasingly scarce resources such as freshwater and arable land. We argue that our best guess about the future has to be based on our knowledge about the relationship between demography, environment and violent conflict in the past. Previous rigorous studies in the field have mostly focused on national-level aggregates. This article represents a new approach to assess the impact of environment on internal armed conflict by using georeferenced (GIS) data and small geographical, rather than political, units of analysis. It addresses some of the most important factors assumed to be strongly influenced by global warming: land degradation, freshwater availability, and population density and change. While population growth and density are associated with increased risks, the effects of land degradation and water scarcity are weak, negligible or insignificant. The results indicate that the effects of political and economic factors far outweigh those between local level demographic/environmental factors and conflict.     

Coercion,vengeance, feud and accommodation: homicide in medieval Iceland

Quantitative methods were employed to situate medieval Icelandic homicide in comparative context. Estimates of homicide rates were derived from samtíðarsögur, and found comparable with European rural medieval homicide estimates: late twelfth‐century Iceland was probably not as violent as a qualitative reading of the sagas might suggest. There were significant differences in patterns of vengeance between íslendingasögur and samtíðarsögur. In íslendingasögur, farmers committing homicide faced flight, outlawry or death; chieftains who initiated homicide might escape justice, although most became embroiled in feud. In samtíðarsögur, lethal vengeance following ordinary homicide was less common, and not a source of feud. These results generate a critique of previous notions of reciprocity in Icelandic vengeance, and support more recent interpretations of early medieval Icelandic society as a highly unequal, divided society. Both sources suggest that, although vengeance may have been legitimated in the language of ‘repayment’, vengeance is best understood within a cross‐cultural context as competitive behaviour designed to achieve superiority rather than parity.     

River metamorphosis and environmental change in the Macdonald Valley,New South Wales,since 1949

A significant metamorphosis of channel form occurred on the lower Macdonald River between 1949 and 1955; width and width-depth ratio increased and depth, sinuosity and weighted mean per cent silt-clay in the channel perimeter decreased. The channel has remained unstable since 1955, exhibiting frequent variations in bed elevation and a recent period of minor channel contraction followed by slight enlargement. Since 1946 there has been an increase in summer and annual rainfall and an abrupt, upward shift of the annual series flood frequency curve. As a result an increased proportion of the total sediment load of the river is now being transported as bed-material load. The change in sediment load is a result of greater stream competence and the consequent reworking of sandy sediment temporarily stored within the channel as benches. The observed channel changes are a quasi-adjustment to the increased flood and bed-material load discharges.     

Brutes, beasts and empire: veterinary medicine and environmental policy in French North Africa and British India

The deep, and persistent, colonial roots of many contemporary environmental policies around the world have been increasingly recognized over the last decade. Research in the sectors of agriculture, forestry, human medicine, and public health has illuminated how environmental policies were constructed and utilized during the colonial period, as well as how many of these policies remain influential today. This paper examines the as yet little explored contribution of colonial veterinary medicine to the development and implementation of environmental policy. By comparing the experiences of the French in North Africa and the British in India, it demonstrates that some colonial veterinarians had a great deal of influence on environmental policy while others had very little. In French North Africa veterinarians played a significant role in developing rangeland management policies that impacted large swaths of these three territories, policies that can still be felt today. In British India, by contrast, the role of colonial veterinarians in developing environmental policy was much more circumscribed and, in the end, largely inconsequential. The paper suggests that three primary factors account for most of this dissimilarity: the differences in animal diseases present in India and the Maghreb; the differences between French and British veterinary education before the twentieth century; and the differences in colonial administration between the two European powers.