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Over the past few years, large-scale land acquisitions in Africa have stoked controversy, making headlines in media reports across the world. Land that only a short time ago seemed of little outside interest is now being sought by international investors to the tune of hundreds of thousands of hectares. Private-sector expectations of higher world food and commodity prices and government concerns about longer-term national food and energy security have both made land a more attractive asset. Dubbed 'land grabs' in the media, large-scale land acquisitions have become one of the most talked about and contentious topics amongst those studying, working in or writing about Africa. Some commentators have welcomed this trend as a bearer of new livelihood opportunities. Others have countered by pointing to negative social impacts, including loss of local land rights, threats to local food security and the risk that large-scale investments may marginalize family farming. Lorenzo Cotula, a leading expert in the field, casts a critical eye over the most reliable evidence on this hotly contested topic, examining the implications of land deals in Africa both for its people and for world agriculture and food security.

In 2004, U.S.consumers spent 5.2 billion purchasing bottled water while the government only invested 5 percent of that amount to purchase critical watersheds, parks, and wildlife refuges-systems vital to clean water and healthy environments.How can we reverse the direction of such powerful economic forces?.

The issue of biofuels has already been much debated, but the focus to date has largely been on Latin America and deforestation - this highly original work breaks fresh ground in looking at the African perspective. Most African governments see biofuels as having the potential to increase agricultural productivity and export incomes and thus strengthen their national economies, improving energy balances and rural employment. At the same time climate change may be addressed through reduction of green house gas emissions. There are, however, a number of uncertainties mounting that challenge this scenario. Using cutting-edge empirical case studies, this knowledge gap is addressed in a variety of chapters examining the effects of large-scale biofuel production on African agriculture. In particular, 'land grabbing' and food security issues are scrutinised, both of which have become vital topics in regard to the environmental and developmental governance of African countries. A revealing book for anyone wishing to understand the startling impact of biofuels and land grabbing on Africa.

Synthesizing almost 30 years of Dutch archaeological research in central and southern Italy, this book discusses and compares settlement and land use patterns from the late protohistoric period to the late Roman Republic. Exploring both social and environmental explanations, as well as interregional parallellisms and divergences, the authors take a multi-scalar approach (from micro-regional to supra-regional) to the long-term development of indigenous Bronze Age tribal pastoralist societies towards the complexity of urbanized Roman society. The culmination of a joint project conducted between 1997 and 2005, the comparative perspective offered by this book is based on the results of long-term landscape archaeological fieldwork projects by the Groningen Institute of Archaeology (in Lazio and Calabria) and the Archaeological Centre of the Free University (in Puglia).Amsterdam Archaeological Studies is a series devoted to the study of past human societies from the prehistory up into modern times, primarily based on the study of archaeological remains. The series will include excavation reports of modern fieldwork; studies of categories of material culture; and synthesising studies with broader images of past societies, thereby contributing to the theoretical and methodological debates in archaeology.This title is available in the OAPEN Library - http://www.oapen.org.

The importance of P originating from agricultural sources to the nonpoint source pollution of surface waters has been an environmental issue for decades because of the well-known role of P in eutrophication. Most previous research and nonpoint source control efforts have emphasized P losses by surface erosion and runoff because of the relative immobility of P in soils. Consequently, P leaching and losses of P via subsurface runoff have rarely been considered important pathways for the movement of agricultural P to surface waters. However, there are situations where environmentally significant export of P in agricultural drainage has occurred (e.g., deep sandy soils, high organic matter soils, or soils with high soil P concentrations from long-term overfertilization and/or excessive use of organic wastes). In this paper we review research on P leaching and export in subsurface runoff and present overviews of ongoing research in the Atlantic Coastal Plain of the USA (Delaware), the midwestern USA (Indiana), and eastern Canada (Quebec). Our objectives are to illustrate the importance of agricultural drainage to nonpoint source pollution of surface waters and to emphasize the need for soil and water conservation practices that can minimize P losses in subsurface runoff

La transformación del mundo rural en la isla de Mallorca durante la Antigüedad tardía presents the study of the rural landscape of the eastern part of the island of Mallorca (Balearic Islands) during Late Antiquity, providing new data that improves our understanding of one of the least well-known periods of the island. The author describes the results of the study of old archaeological surveys carried out on the island - which had not been published yet - and the results of new archaeological surveys. The conclusions from these studies detected a series of trends that help to better understand the settlement patterns of the island during the transition from the Roman period to medieval times. Furthermore, they help to obtain an overview of different transformations that occurred in the rural world in a territory that was strongly marked by its insularity. Equally discernable in this territory was the role played by the old indigenous substrate, which was reflected in the survival or re-use of pre and proto-historic settlements.

Soil erosion has been considered as the primary cause of soil degradation since soil erosion leads to the loss of topsoil and soil organic matters which are essential for the growing of plants. Land use, which relates to land cover, is one of the influential factors that affect soil erosion. In this study, impacts of land use changes on soil erosion in Pa Deng sub-district, adjacent area of Kaeng Krachan National Park, Thailand, were investigated by applying remote sensing technique, geographical information system (GIS) and the Universal Soil Loss Equation (USLE). The study results revealed that land use changes in terms of area size and pattern influenced the soil erosion risk in Pa Deng in the 1990–2010 period. The area with smaller land cover obviously showed the high risk of soil erosion than the larger land cover did.

Physical, chemical and bacteriological analyses were carried out of water samples from three boreholes located near a landfill, and or soil samples at Akure, Nigeria, to ascertain the effect of the dumpsite on the groundwater and soil quality. The samples from borehole locations with radial distances of 50, 80, and 100 m, respectively, away from the landfill and twelve soil samples collected at distances 0 (dump centre), 10, 20, and 30 m away from the refuse dump were analysed. The parameters determined were the turbidity, temperature, pH, dissolved oxygen (DO), total dissolved solids (TDS), total hardness (TH), total iron, nitrate, nitrite, chloride, calcium and heavy metals like copper, zinc, and lead. Most of these parameters indicated pollution but were below the World Health Organization (WHO) limits for consumption. The pH ranged from 5.7 to 6.8 indicating toxic pollution, the turbidity values were between 1.6 and 6.6 NTU, and the temperature ranged from 26.5°C to 27.5°C. The concentrations of iron, nitrate, nitrite and calcium ranged from 0.9 to 1.4, 30 to 61, 0.7 to 0.9, and 17 to 122 mg/l, respectively. Out of heavy metals, zinc ranged between 3.3 and 5.4 mg/l and lead ranged from 1.1 to 1.2 mg/l. Soil water holding capacity, porosity, pH, organic matter, organic carbon and organic nitrogen ranged from 38 to 54, 44 to 48, 6.9–7.5, 2.44–4.27, 1.42–2.48, and 0.12–0.21%, respectively. Statistical analyses indicated significant differences at 95% level. The results showed that all the boreholes were not strongly polluted but require treatment before use while the soil is absolutely unsuitable for the crop production. Re-designing of sanitary landfills to prevent leachate from getting to the water table, adoption of clean technology for recycling greenhouse gases and a sustainable land management programme for reclamation are recommended.

A two-component model was devised, comprising young and old soil C, two decay constants, and parameters for litter input, \"humification,\" and external influences. Due to the model's simplicity, the differential equations were solved analytically, and parameter optimizations can be made using generally available nonlinear regression programs. The calibration parameter values were derived from a 35-yr experiment with arable crops on a clay soil in central Sweden. We show how the model can be used for medium-term (30 yr) predictions of the effects of changed inputs, climate, initial pools, litter quality, etc., on soil carbon pools. Equations are provided for calculating steady-state pool sizes as well as model parameters from litter bag or14C-labeled litter decomposition data. Strategies for model parameterization to different inputs, climatic regions, and soils, as well as the model's relations to other model families, are briefly discussed.