Assessment of land use and land cover changes and valuation of carbon stocks in the Sergipe semiarid region,Brazil: 1992–2030

The semiarid region in the state of Sergipe, Brazil, approximately 11,000 km², has experienced high deforestation rates in the last decades, which ultimately contribute to global climatic changes. The valuation of ecosystem services of CO₂ sequestration can support definition of environmental policies to decrease deforestation in that region. This study aimed to assess land use and land cover changes in the Sergipe semiarid region between 1992 and 2017 by applying remotely sensed data and technics; simulate the land use and land cover changes between 2017 and 2030 by applying a cellular automaton model, by assuming current land use trends (Business as Usual – BAU) as a reference scenario, and a more conservative scenario (Protected Forest – PF), in which was assumed an effective enforcement of the Brazilian Forest Code established in 2012; simulate the carbon stocks by 2017 assuming the BAU and PF scenarios by 2030, and estimate the Carbon balance between the 2030 and 2017 scenarios; and estimate the economic valuation of carbon emission and sequestration by using the InVEST software. The results showed that agriculture (cropped lands) was main driver of the landscape changes in the study area, which increased 14% by 2017, a net increase of 1494.45 km². The results showed that the total Carbon emissions would reach 736,900 Mg CO₂-eq by assuming the BAU scenario, which would increase the cost of opportunity up to US$ 17.7 million and a social carbon cost varying between US$ 10.3 and US$ 30.2 million. The restoration of the permanent preservation areas could contribute to increase Carbon sequestration up to 481,900 Mg CO₂-eq by 2030, which is equivalent cost of US$ 11.6 million. The natural landscape in the Sergipe semiarid region was strongly affected by deforestation activities occurred between 1992 and 2017. It requires, therefore, effective actions to support and promote restoration of degraded areas. The forested areas within the Sergipe semiarid region were the most affected type of vegetation because of expansion of agricultural fields soil exposures (Exposed Land). Environmental assessments based on scenarios and economic valuations can provide crucial information to support policy and decision makers to improve strategies for environmental management and conservation.     

Bridging between the regional degree and the community approaches to rurality—A suggestion for a definition of rurality for everyday use

The territorial approach to rural development highlights the role of local actors, networks, culture, nature and landscape amenities. The Organization for Economic Co-operation and Development (OECD) definition of rurality is, however, not capable of dealing with local and community definitions of rurality, which vary from study to study. In everyday life, physical planners, rural policymakers and local rural actors need a consistent definition of rurality. The reason is that structural reforms have led to larger administrative units that have less experience-based knowledge about the individual rural communities within a municipality than do local authorities. In this article, we propose a consistent definition of rurality that is easy for physical planners, rural policy makers and local rural actors to understand and apply in everyday use. In addition, our definition will be able to deal with both the regional and the community approach to rurality. This definition is based on an interdisciplinary literature review that starts with land cover and geographical mapping. The definition is then applied to the case of Denmark.     

Is the widespread use of urban land for cycling promotion policies cost effective? A Cost-Benefit Analysis of the case of Seville

Cycling promotion has without doubt been the most intensive policy seen in Seville in the 21 st century as far as the use of public land is concerned. In the current context, economic tools need to be applied to rigorously assess the efficiency and economic rationality of cycling infrastructure investments. This article provides a Cost-Benefit Analysis to estimate the economic and social returns on investments from the construction of a bicycle lane network in the city of Seville (Spain). This kind of studies tries to contribute to mitigating the degree of conflict associated with a land policy that breaks with the traditional status quo. The case study is especially relevant due to the successful public policy implemented in recent years to transform the Seville's urban mobility model into a sustainable system. Based on fieldwork with two survey campaigns conducted among the different cyclist profiles (private bicycle users and public bicycle sharing system users), we analyze two major effects: modal change and changes in journey time. Our robust findings, subjected to a sensitivity analysis, point to the remarkable economic benefits of the bicycle promotion policy in Seville, with significant savings in travel times, vehicle use and infrastructure maintenance, health, traffic accidents, and air pollution for both cyclists and society as a whole.     

Why have land use change models for the Amazon failed to capture the amount of deforestation over the last decade?

Land cover change in the Neotropics represents one of the major drivers of global environmental change. Several models have been proposed to explore future trajectories of land use and cover change, particularly in the Amazon. Despite the remarkable development of these tools, model results are still surrounded by uncertainties. None of the model projections available in the literature plausibly captured the overall trajectory of land use and cover change that has been observed in the Amazon over the last decade. In this context, this study aims to review and analyze the general structure of the land use models that have most recently been used to explore land use change in the Amazon, seeking to investigate methodological factors that could explain the divergence between the observed and projected rates, paying special attention to the land demand calculations. Based on this review, the primary limitations inherent to this type of model and the extent to which these limitations can affect the consistency of the projections will also be analyzed. Finally, we discuss potential drivers that could have influenced the recent dynamic of the land use system in the Amazon and produced the unforeseen land cover change trajectory observed in this period. In a complementary way, the primary challenges of the new generation of land use models for the Amazon are synthesized.     

Constructing landscapes of value: Capitalist investment for the acquisition of marginal or unused land—The case of Tanzania

The current global wave of land acquisition – variously debated as land grabbing or investment in land – is promoted by the World Bank and the FAO as creating win–win-situations for local populations and investors alike. Common policy recommendations suggest expanding the production of export crops, by making use of marginal or unused land. Considerable potentials for such an expansion are assumed. Taking Tanzania as a case study, the evidence for such types of land is assessed by using a broad range of statistics. We will argue firstly, that the terms marginal and unused land serve as a manipulative terminology for the benefit of attempts to commercially valorize and commodify African landscapes, from biofuel to large-scale food production and tourism. However, they relate to different rationalities of domination. Unused land refers to a state-bureaucratic narrative, which excludes user groups deemed irrelevant for national development, while marginal land refers to a capitalist-economic narrative that excludes what is not profitable. Secondly, the terms are analyzed as categories central for state simplification of social relations attached to land. Modelling of these land use categories based on remote sensing is an attempt to compensate weak state capacities to enhance the legibility of the landscape by constructing it as a landscape of commercial value.