One of the Indus Civilization's most striking features is its cultural uniformity evidenced by a common script, artefact forms and motifs, weights and measures, and the presence of proscribed urban plans. Early excavators and commentators utilized ideas of diffusion, and concepts of kingship and slavery remained prevalent within interpretations of the Indus. Whilst Childe questioned ideas of diffusion and hereditary rule he still identified a system of economic exploitation in which the vast majority of the population was subordinated. More recently scholars have begun to argue that small sections of the Indus population may have willingly subordinated themselves in order to secure positions of power. This article explores the dichotomy between traditional Eurocentric normative models of social organization and those derived from south Asian cultural traditions.

Introducing the methods of archaeoclimatology, the authors measure the relative locus of the monsoons, the intensity of winter rains and the volume of water in the rivers in the Upper Indus, in the region of Harappa. They also note the adoption of a multi-cropping agricultural system as a possible strategy designed to adjust to changing conditions over time. They find that around 3500 BC the volume of water in the rivers increases, and the rivers flood, implying annual soil refreshment and the consequent development of agriculture. By contrast, from around 2100 BC the river flow begins to fall while the winter rains increase. This time-bracket correlates nicely with the brief flourishing of Harappa. The locally derived evidence from Harappa combined with the Beas survey data provide a model for understanding the abandonment of settlements in the Upper Indus and possibly the wider civilisation.

Life beside the ancient Indus may not have been so peaceful and egalitarian as has sometimes been thought. Arguing from weapons, the author shows that Harappans only appear to be militarily under-endowed in comparison with Mesopotamians because their assemblages are derived from settlement finds rather than grand tombs.

The authors report a reconstruction of the palaeogeography around the Harappan town of Lothal, major port of the Indus civilisation, using multispectral satellite imagery and environmental analysis. Key results include the identification of a broad tidally influenced palaeochannel adjoining the western part of Lothal and a former estuary towards the east. Micropalaeontological analyses show that Lothal developed over a tidal salt marsh and was subsequently left high and dry as the sea level dropped.

Palaeoethnobotanical evidence reveals that there was increasing emphasis on greater varieties of species and cropping practices in the changing subsistence of the Indus civilization: agricultural intensification is discussed in relation to social and environmental changes.