Land use changes and transnational migration

The present study focuses on the economic, political/institutional, technological, cultural, demographic and environmental drivers of land use change. It aims to understand the factors influencing land use decisions at the household level, in particular the influence of migration. The study is guided by the hypothesis that international migration is driving land use change through the investment of remittances, funds sent back by migrants to their families in the country of origin. This research is based on a political ecology approach and the conceptual framework relies on three theoretical concepts. First, the concepts of proximate causes and driving forces were used to identify the factors behind changing land use. In addition, the concept of remittance landscapes, a concept developed in the framework of this study, which is defined as an emerging type of landscape driven by the investment of remittances, was used to evaluate the impact of remittances on land use in the study area. Fieldwork was conducted in the municipality of Autlán in the state of Jalisco in Mexico over a total period of 8 months between 2002 and 2004. Land use changes between 1990 and 2000 were quantified based on satellite image analysis. Underlying driving forces of these changes were examined based on land use change data collected by survey as well as data available from municipal, state and federal agencies. Land use changes observed in the study area between 1990 and 2000 include a slight increase of agricultural land (2%), of urban land cover (0.5%) and of pine-oak forest (0.7%). Over the same period, pasture increased by 18% while dry forest decreased by 10%. Rapid and extensive land use change is occurring on rainfed agricultural land, as maize cultivation is converted to the cultivation of agave azul used for the production of tequila. The first plantations of agave azul were established in 1996 and by 2002, agave azul was planted on 33% of all rainfed agricultural land of the municipality. 84% of owners of rainfed land included in the survey had changed land use from maize to agave during this time period. The dynamics of several proximate causes are driving this change: 1) Market prices for maize decreased by 46% between 1994 and 2004 while the costs for agricultural inputs continually increased so that the cultivation of rainfed maize was no longer economically profitable; 2) The variability of rainfall combined with a lack of irrigation water limits the choice of economically viable alternatives to agave azul; 3) In the large majority of cases, landowners rent out their land to tequila companies in reverse leasing arrangements for seven-year periods (the duration of one growing cycle of agave azul). During this time they do not have to work on their own fields and are free to find off-farm employment or to migrate to the US and; 4) Landowners continue to receive agricultural subsidies even though the land is rented out, as agave azul is one of the eligible crops. Overall, the main driving forces identified in the study area are economic (market prices), environmental (variability of rainfall, soil quality, topography), political/institutional (agricultural subsidies, land tenure) and demographic (labor availability). Technology and culture appear to be less important. Results of the present study confirm the hypothesis that global factors, especially international trade agreements such as NAFTA (North American Free Trade Agreement) increasingly influence land use change. However, they are not sufficient to function as a sole driver of land use change. Environmental factors are a critical determinant of whether a certain land use change will occur or not. The decisive aspect behind the observed land use changes are the multiple interactions between specific factors at different levels and not the predominance of one particular driving force functioning at a particular level. International migration is a significant livelihood strategy in the study area, especially for lower-income communities. On average, 50% of all households have or had at least one family member in the US as a migrant between 1980 and 2004, and remittances represent 45% of total household income. In general, the bulk of remittances income is used for subsistence needs and to repay debts. Nevertheless, on average, 30% of migrant households invest remittances in land, livestock, agricultural production and in house construction. All these investments lead to land use changes. The impact of remittances on land use changes is variable, and depends on the socio-economic, political and environmental context of the community and the individual situation of the migrant household. In low-income communities, remittances might be used to repair existing housing, while in higher-income communities, remittances are used to construct a new house, converting agricultural to urban land. With regard to changes in labor availability due to out-migration, the results are ambiguous. Migration can drive land use change by encouraging a shift to low-labor land use systems, but these land use changes that require less labor can also drive migration. The concept of remittance landscape developed by the researcher has proved useful for analysing the impact of remittances on land use changes. A combination of area-based and actor-based evaluation criteria are effective in order to describe quantitative as well as qualitative landscape transformations driven by the investment of remittances. Landscapes where the investment of remittances leads to a change of land use from subsistence to cash crop cultivation should be included as a potential type of remittance landscape, even though the basic type of the landscape (agricultural) remains unchanged. Accordingly, at least six different types of transformations into remittance landscapes are possible: a) forest to pasture, b) forest to agriculture, c) forest to urban, d) agriculture to pasture, e) agriculture to urban and f) change of agricultural system. In conclusion, the study area on which this research focused is not considered to contain any remittance landscapes because remittances are only partially driving the extensive land use changes occuring in the region.

A Contextual Analysis of Land-Use and Vegetation Changes in Two Wooded Pastures in the Swiss Jura Mountains

Alexandre Buttler, Joël Chételat, François Gillet, Michaël Kalbermatten, Kathryn Lannas, Alexander Ludwig Johannes Peringer, Thomas Spiegelberger

This study examines the effects of land-use policies and natural events on the evolution of two wooded pastures in the Jura Mountains in Switzerland between 1934 and 2000. The socioeconomic context and the local conditions were seen as major driving forces influencing land management practices which in turn redefined land-use policies. We studied the dynamics of the Jura Mountains' wooded pastures, combining a thorough knowledge of the historic context with aerial image analysis. Besides pointing out general milestones in the evolution of Swiss land policy, we compiled chronicles on the management for both study sites on the basis of archives and interviews. Aerial images taken at time intervals of approximately 15 years were chosen to identify land-cover changes. The method used to analyze them relied on a structural classification of phytocoenoses, thus allowing the determination of four categories of tree-cover densities ranging from unwooded pastures to ungrazed forest. We reported overall aerial changes for each tree density class as well as spatial transitions from one category to another. The combination of spatial statistics with qualitative data depicting the evolution of the historic context gives a better understanding of the land-use changes and their rationale. The most important changes in tree density occurred during World War II and resulted in a more open landscape. The intensive use of wooded pastures during the war was the consequence of a high demand for wood and food resources. Postwar protectionist regulations, agricultural subsidies, and technical improvements maintained considerable pressure on wooded pastures. Storms and drought episodes further exacerbated this process in some areas. The trend then reversed from the 1970s onwards because of the limitations put on milk production and the falling price of wood. This resulted in a more extensive use of pastures, leading to tree encroachment. However, remote sites were more impacted than pastures closer to inhabited areas, which exhibited a trend towards more segregation between grassland and densely wooded pastures. With both extensification and segregation of land use, the complex vegetation mosaic and the landscape diversity that characterize wooded pastures are threatened but still offer good economic opportunities that call for differentiated management strategies.

Resilience Alliance2013

Villes à la frontière et transformation de l'espace

Lena Poschet El Moudden

Few borders exist which separate two countries as dramatically disparate as the Dominican Republic and Haiti. Both share the territory of the Hispaniola island, but a profound process of differentiation rooted in the colonial division of the island between France and Spain and ideologically maintained by both modern nations, has lead to what Théodat (1998, 2003) calls the "twofold insularity" – each country behaves as if it were located on a separate island. In spite of all prejudices and ethnical, historical, linguistic, social, economic or religious differences, people living in the border regions established cross-border relations which, even if largely based on economic interests, are much more frequent and important to both nations than officially admitted (De Jesus Cerdano and Dilla, 2005; Sillé & Segura & Cabral, 2002). The local dynamic created by this exchange becomes palpable when one observes the busy binational market in the border towns of Ouanaminthe (Haiti) and Dajabón (Dominican Republic). Twice a week, people from nearly the whole northern part of both countries travel to these towns located on either side of the Masacre River, in order to buy and sell goods or to offer services in the market of Dajabón. The other days, tons of cargo transit to Haiti, to the extent that the once small borderland settlements have become an important junction in the economic subsystem of the northern part of the island. Moreover, the construction of a free zone in Ouanaminthe in 2002 –to produce textiles for the US-market– has connected the borderland towns to the international economy. This recent development is set within a context of progressive opening of borders (Martinez, 1994). It is the result of international policies that have been decided in the capitals, without consulting the concerned regions. In Ouanaminthe and Dajabón, local institutions are weak and receive no or little financial and administrative support from central administration. They do not have the means to cope with growing pressure on land and infrastructure, as the emergence of legal and illegal livelihood opportunities in the borderland has generated a threefold increase of the overall population in the past twenty years (Dajabón grew from 8'500 inhabitants in 1980 to 16'000 in 2002 and Ouanaminthe from 7'000 in 1981 to 39'000 in 2003). How did these recent economic, political and societal transformations shape the urban space of the two borderland towns? I addressed this issue by analyzing the motivation of stakeholders involved in the process of spatial transformation, and the impact of their actions. In my work I refer to the conceptual framework of urban intermediation (Bolay and Rabinovich, 2004), i.e. the spatial issues that each town has to address according to its internal characteristics, its function in national and international networks and its relation to the direct rural environment. In order to use this framework for the borderland issues, the conceptual part of this study proposes to develop the concept of "borderland intermediation". To the existing urban intermediation concept, it adds the influence of the characteristics of the border (based on policy and political aspects, economic issues, local identities, social networks, national defense issues and geographical insertion). By doing so, it relates the bi-national system of borderland towns to the intermediation concept. Data has been collected over three and a half years during several periods of fieldwork: observation and mapping of occupation and use of urban space, cartography, qualitative interviews with local stakeholders and residents, completed by other primary and secondary sources. This study shows that the recent transformations have accentuated the existing unbalanced relationship between the two towns. The powerlessness of the municipality of Ouanaminthe to meet population growth and to impose regulations or taxes related to the growing trade has enhanced its dependency to the Dominican town. For a growing number of Haitians, it is of existential importance to cross over to Dajabón in order to seek income, healthcare and education and this, in spite of latent racism and mistreatments. Founded on a strong sentiment of exploitation, Haitians often criticize the capitalist or even colonialist relationship imposed by their neighbors: not only the fact that the bi-national market takes place in Dajabón, but also that Dominican enterprises develop subsidiaries in Ouanaminthe, taking advantage of cheap labor and the absence of local production. On the contrary, the majority of Dajabón residents interviewed do not need to cross the river for their living. Most of them have never been to Ouanaminthe, but consider it insalubrious, out of control and dangerous. Both towns lack application of regulations in urban planning matters. Thus, spatial growth has entirely been ruled by landowner structure and land occupation practices. Around Dajabón, the adjacent land belongs mainly to two landowners, whose strategy –to enhance soil value through development of equipped middleclass neighborhoods– has restricted the urban sprawl. In Ouanaminthe land belongs to a multitude of small peasants. The selling and illegal occupation of rather small plots leads to sprawling urban growth, guided by rural pathways and leaving entire parts of neighborhoods inaccessible to motor vehicles. Population growth has also been absorbed by high densification of existing neighborhoods. No formal collaborations exist between the two municipalities. Informal ones do, through the implication of the two mayors, but overall, cross-border collaboration is left to NGOs and professional associations who militate for human rights, environmental issues and fair treatment inside the bi-national market. International development agencies present in the borderland initiate projects with bi-national concern, but these are disconnected from the local level and strongly influenced by the fact that these agencies relate directly to the central governments. We also observe a process of internal segregation in both towns, as commercial establishments progressively occupy parts of the town centers and the emergent middle class gathers in specific neighborhoods. Ouanaminthe and Dajabón are functionally interlinked and their transformation is undeniably governed by the progressive permeability of the border. Nevertheless, this border separates two completely different urban landscapes that are deeply marked by the internal characteristics of each town. Furthermore, the unequal and complex relationship of both populations creates the paradox that their spatial proximity accentuates the segregation in both towns, as it allows the citizens of both countries to stay in their environment and to commute –if necessary– even daily. This work shows that the application of the intermediation concept is relevant for the study of complex relationships that govern borderland space. The analysis based on this concept has enabled to study, on a local level, processes that are taking place on a global level. In so doing, it has allowed us to provide some answers to the central question: "How do local populations, national and international firms and governments react when a territorial economy, based on agriculture, is progressively linked to international networks? "

EPFL2006

Methodology for the identification of promising integrated biorefineries

Ayse Dilan Celebi

Steady increase in global energy consumption, greenhouse gas emissions, and depletion of fossil energy resources, together with increased attention towards sustainable development has prompted researchers to discover economical and environmentally competitive non-petroleum alternatives and biomass is considered to be one of the most promising renewable sources of energy and carbon of this matter to address the aforementioned issues within a biorefinery platform. A biorefinery is an integrated processing facility that converts biomass into transportation fuels, value-added chemicals, heat, and electricity via biochemical and thermochemical conversion routes. Integrated biorefineries are capable of mimicking petroleum refineries via application of advanced process synthesis methods including modeling, simulation, integration and optimization techniques. This thesis presents a comprehensive synthesis methodology for the integration of bioprocessing technologies in biorefineries by addressing techno-economic and environmental sustainability analysis. The proposed systematic design approach combines advanced process modeling approaches, process integration techniques, and multi-objective optimization algorithms to assess the performance of the overall system with respect to economic, environmental, and energetic indicators. The design strategy is applied based on different case studies. Results indicate that multi-product processes can yield significant cost and environmental benefits. Additionally, the integration of biochemical and catalytic processes with thermochemical conversion pathways results in increased carbon efficiency and economic and environmental competitiveness. Synergies between biorefineries and energy system are assessed by integrating industrial plants with a cogeneration system producing biofuels and process heat. In doing so, system efficiency is increased by coupling the proposed cogeneration system with carbon capture and sequestration (CCS) and power-to-gas technologies to store the renewable intermittent electricity in the form of biofuels. The results exhibit that through system expansion, integrated biorefinery systems allow us to imitate fossil refineries with a large spectrum of bio-based products. This further increases the resource efficiency while offering a promising solution to mitigate CO2 emissions and hence reaching the longer-term decarbonization target set by the Paris Agreement.

EPFL2019