• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 317
  • 85
  • 21
  • 6
  • 4
  • 3
  • 3
  • 2
  • 2
  • 1
  • 1
  • 1
  • Tagged with
  • 613
  • 613
  • 268
  • 232
  • 119
  • 96
  • 76
  • 74
  • 73
  • 58
  • 58
  • 56
  • 55
  • 50
  • 50
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
501

You Are What You’re Wearing : An Analysis of Strategies Promoting for an Environmentally Sustainable Fashion Industry / Du Är Vad Du Har På Dig : En Analys av Strategier som Främjar för en Miljömässigt Hållbar Modeindustri

Lindgren, Kristina January 2022 (has links)
The fashion industry's progress towards sustainability is often a complex journey and changes within the industry, both ongoing changes and those required to achieve sustainability, cannot be singled out as something only of material considerations or bound to a specific stage within a lifecycle. This paper examines how a selection of environmentally inclined sustainability strategies within the fashion industry, contributes to or counteracts the industry's progress towards environmental sustainability. Including the overall work towards a sustainable development. The aim is also to understand how to lead the fashion industry toward an environmentally sustainable development and understand how sufficient they are in their current work. Strategies that aim to improve the environmental sustainability within the fashion industry are plenty, which can cover large and significant parts of the industry. Many depart from innovative approaches and aim to bring significant change and contribution to the fashion industry's work toward sustainable development. As concluded within this study, one strategy is not enough to solve the entire sustainability conundrum, since each strategy has proven to contribute with significant environmental impact reduction potentials, however the resulting environmental impacts' counteractions are equally significant. Thus, the most considerable potential for environmental sustainability can be gained when combining various strategies and implementing them during certain stages - because where one strategy is lacking, another can contribute, complement and/or reinforce. / Modebranschens framsteg mot hållbarhet är oftast en komplex resa. Förändringar inom branschen, både pågående förändringar och de som krävs för att uppnå hållbarhet, kan inte pekas ut som något enbart materiellt eller bundet till ett specifikt skede i en livscykel. Denna studie undersöker hur ett urval av miljöanpassade hållbarhetsstrategier inom modebranschen bidrar till eller motverkar branschens framsteg mot miljömässig hållbarhet. Syftet med studien är att delvis förstå hur man leder modebranschen mot en miljömässigt hållbar utveckling samt förstå hur tillräckliga de är i sitt nuvarande arbete.  Det finns ett antal strategier som syftar till att förbättra den miljömässiga hållbarheten inom modebranschen och kan täcka stora samt betydande delar av branschen. Många vilka utgår från innovativa tillvägagångssätt som strävar efter att åstadkomma betydande förändringar och bidrag till modebranschens arbete mot hållbar utveckling. Slutsatsen i denna studie är det inte är tillräckligt med en strategi för att lösa hela hållbarhetsproblemet, eftersom varje strategi inom denna studie har visat sig bidra med betydande potential för att minska miljöpåverkan, men även resulterat till lika betydande motverkningar. Den största potentialen för miljömässig hållbarhet är när man kombinerar olika strategier och implementerar dem under vissa skeden.
502

Evaluación de la sostenibilidad ambiental de la producción citrícola en el Uruguay mediante análisis de ciclo de vida

Cabot Lujambio, María Inés 10 November 2023 (has links)
Tesis por compendio / [ES] Los cítricos son el cultivo frutícola más importante de Uruguay en términos de producción, superficie y aporte económico. Considerando la gran contribución de los sistemas agroalimentarios a los impactos ambientales, evaluar aquellos asociados a la producción citrícola en el país cobra gran relevancia para transitar hacia sistemas alimentarios sostenibles. En esta línea, el objetivo de la presente tesis es evaluar estos impactos ambientales mediante la utilización del análisis de ciclo de vida (ACV) y estudiar aspectos metodológicos clave de su aplicación a la producción citrícola. Se lleva a cabo una revisón crítica de la literatura de ACV de cítricos y se desarrollan cuatro casos de estudio en establecimientos representativos de la región, en concreto, la producción de limones, mandarinas y naranjas, y la producción de plantones en vivero. Los impactos se evalúan de la cuna hasta la puerta del establecimiento, usando unidades funcionales tanto de masa como de área y datos primarios correspondientes a varias temporadas de cultivo. Los principales puntos críticos ambientales detectados son las emisiones de campo producto de la aplicación de fertilizantes, la irrigación, y la producción de óxidos de cobre. Desde el punto de vista metodológico, se destaca la importancia de usar distintas unidades funcionales y de abordar la variabilidad temporal y la especificidad según el sitio de los datos de inventario, así como de usar métodos de caracterización de impactos regionalizados. Se observa que la contribución de las primeras etapas del cultivo al impacto ambiental de la producción citrícola es baja. / [CA] Els cítrics són el cultiu de fruita més important de l'Uruguai en termes de producció, superfície i aportació econòmica. Considerant la gran contribució dels sistemes agroalimentaris als impactes ambientals, avaluar aquells associats a la producció citrícola del país cobra gran rellevància per a transitar cap a sistemes alimentaris sostenibles. En aquesta línia, l'objectiu de la present tesi és avaluar aquests impactes ambientals utilitzant l'anàlisi de cicle de vida (ACV) i estudiar aspectes metodològics claus de la seua aplicació a la producció citrícola. Es fa una revisió crítica de la literatura d'ACV de cítrics i es desenvolupen quatre casos d'estudi en explotacions representatives de la regió, en concret, la producció de llimes, mandarines i taronges, i la producció de plançons en viver. Els impactes s'avaluen del bressol fins a la porta de l'establiment, usant unitats funcionals tant de massa com d'àrea i dades primàries corresponents a diverses temporades de cultiu. Els principals punts crítics ambientals detectats són les emissions de camp, producte de l'aplicació de fertilitzants, la irrigació, i la producció d'òxids de coure. Des del punt de vista metodològic, es destaca la importància d'usar diferents unitats funcionals i d'abordar la variabilitat temporal i els aspectes lloc-específics de les dades d'inventari, així com d'usar mètodes de caracterització d'impactes regionalitzats. S'observa que la contribució de les primeres etapes del cultiu a l'impacte ambiental de la producció citrícola és baixa. / [EN] Citrus is the most important fruit crop in Uruguay in terms of production, area, and economy. Considering the great contribution of agri-food systems to environmental impacts, evaluating those associated with citrus production in the country becomes highly relevant to move towards sustainable food systems. In this line, the goal of this dissertation is to evaluate these environmental impacts using life cycle assessment (LCA) and to study key methodological aspects of its application to citrus production. Literature on citrus LCA is critically reviewed and four case studies are developed in representative agricultural holdings of the region, specifically, the production of lemons, mandarins and oranges, and the production of seedlings in nurseries. Impacts are assessed from cradle to gate, using both mass and area functional units and primary data for several growing seasons. The main environmental hotspots detected are on-field emissions from fertiliser application, irrigation, and copper oxides production. As to methodology, the relevance of using different functional units and addressing temporal variability and site-specificity of inventory data is highlighted, as well as using regionalised impact characterisation methods. It is observed that the contribution of the first stages of the crop to the environmental impacts of citrus production is low. / Maria Inés Cabot is the recipient of a PhD scholarship (POS_EXT_2018_1_154319) from the National Agency for Research and Innovation (ANII, Uruguay) and received a support scholarship for the completion of postgraduate studies (BFPD_2023_1#46477920) from the Postgraduate Academic Commission (CAP, University of the Republic). / Cabot Lujambio, MI. (2023). Evaluación de la sostenibilidad ambiental de la producción citrícola en el Uruguay mediante análisis de ciclo de vida [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/199490 / Compendio
503

Circular Economy, and Environmental Impacts of Renewable EnergyTechnogies : A comparison between Sweden and Denmark

Jose, Sebin, Geetha, Vijitha January 2024 (has links)
This thesis delves into the environmental impacts of renewable energytechnologies, focusing on a comparative analysis between Sweden andDenmark. Through extensive literature review and empirical analysis, thestudy examines the environmental implications of various renewable energysources, including wind, solar, and biomass, in both countries. By consideringfactors such as life cycle assessments, carbon emissions, land use, andecosystem impacts, the research aims to provide insights into thesustainability and environmental performance of renewable energydeployment strategies. Furthermore, the thesis evaluates the effectiveness ofpolicy interventions and regulatory frameworks in mitigating environmentalimpacts and promoting sustainable energy transitions in Sweden andDenmark. By comparing policy approaches, technological innovations, andindustry practices, the research seeks to identify best practices and lessonslearned for advancing environmental sustainability in the renewable energysector. Additionally, the study examines future perspectives and emergingtrends, such as circular economy principles and energy system integration,which could further enhance the environmental performance and resilience ofrenewable energy systems in both countries. Overall, this thesis contributesto a deeper understanding of the environmental implications of renewableenergy technologies and provides valuable insights for policymakers,industry stakeholders, and researchers seeking to promote sustainable energytransitions and mitigate climate change.
504

Alignment of various environmental authorisation processes for the mining industry / Wessel Johannes Oosthuizen

Oosthuizen, Wessel Johannes January 2012 (has links)
Mining contributes significantly to the economic development of South Africa, contributes to pollution and other negative environmental impacts. Section 24 of the Constitution of the Republic of South Africa, 1996 (Constitution) places a duty on government to, amongst others adopt legislative measures to protect the environment, prevent pollution and degradation, and secure sustainable development, while promoting justifiable economic and social development. Government responded with the introduction of new acts or the amendment of existing acts most of which require an authorisation process as a “command and control” tool to enforce environmental governance within the mining sector. The abovementioned legislative development will be discussed from a historical perspective up to the current developments. The research aims to attempt to align the authorisation process pertaining to mining. The mining life cycle will be illustrated and the authorisation requirements for each of the mining life cycle processes will be discussed alongside its challenges such as fragmentation, lack of capacity in government sectors, lack of communication and cooperative governance within government. The lack of focus within the authorisation requirements will be deliberated. To avoid the negative consequences of the current authorisation processes such as duplication, unnecessary time delays and the stifling of economic growth, an investigation into how the various fragmented authorisation processes can be aligned into a single streamlined authorisation process which will contribute to the sustainable development within South Africa will be made. / MPhil (Environmental Law and Governance), North-West University, Potchefstroom Campus, 2013
505

Alignment of various environmental authorisation processes for the mining industry / Wessel Johannes Oosthuizen

Oosthuizen, Wessel Johannes January 2012 (has links)
Mining contributes significantly to the economic development of South Africa, contributes to pollution and other negative environmental impacts. Section 24 of the Constitution of the Republic of South Africa, 1996 (Constitution) places a duty on government to, amongst others adopt legislative measures to protect the environment, prevent pollution and degradation, and secure sustainable development, while promoting justifiable economic and social development. Government responded with the introduction of new acts or the amendment of existing acts most of which require an authorisation process as a “command and control” tool to enforce environmental governance within the mining sector. The abovementioned legislative development will be discussed from a historical perspective up to the current developments. The research aims to attempt to align the authorisation process pertaining to mining. The mining life cycle will be illustrated and the authorisation requirements for each of the mining life cycle processes will be discussed alongside its challenges such as fragmentation, lack of capacity in government sectors, lack of communication and cooperative governance within government. The lack of focus within the authorisation requirements will be deliberated. To avoid the negative consequences of the current authorisation processes such as duplication, unnecessary time delays and the stifling of economic growth, an investigation into how the various fragmented authorisation processes can be aligned into a single streamlined authorisation process which will contribute to the sustainable development within South Africa will be made. / MPhil (Environmental Law and Governance), North-West University, Potchefstroom Campus, 2013
506

Analyse de cycle de vie de la production bovine : exploration de pratiques et de changements de système pour réduire les impacts environnementaux / Life cycle assessment of cattle production : exploring practices and system changes to reduce environmental impacts

Nguyen, Thi Tuyet Hanh 21 December 2012 (has links)
Cette thèse porte sur l’étude des impacts environnementaux de systèmes de production de bovins. Le premier objectif était d’analyser et de comparer les impacts environnementaux de systèmes de production de viande et de lait par analyse de cycle de vie (ACV) attributionnelle. Les effets de pratiques d’atténuation de ces impacts ont été évalués pour les systèmes de production de viande. Le second objectif était un développement méthodologique afin d’explorer les conséquences possibles d’une préférence accrue pour un lait produit à base d’herbe, par ACV conséquentielle. Dans un système de production de viande par le troupeau allaitant, le méthane entérique a été le principal contributeur à l’impact changement climatique, et la production de l’herbe a été la principale contributrice aux autres impacts (demande énergétique cumulée, eutrophisation, acidification, occupation du sol). L’atelier naisseur (vaches allaitantes et leurs veaux, génisses) a contribué de manière majeure aux impacts du système allaitant dans son ensemble. La pratique d’atténuation la plus efficace pour le système a été la diminution de l’âge au vêlage de 3 à 2 ans. L’utilisation de lipides riches en acides gras oméga-3 dans le régime a très peu affecté les impacts du système. L’application simultanée de plusieurs pratiques d’atténuation compatibles entre elles réduit sensiblement les impacts. L’application de pratiques telles que la réduction du gaspillage d’herbe, l’engraissement des génisses non utilisées pour le renouvellement et la diminution de l’âge au vêlage réduisent l’occupation du sol. Un usage alternatif des terres libérées tel que la plantation de forêt pour séquestrer du carbone dans la biomasse semble prometteur. L’étude de systèmes de production de lait a été centrée sur les comparaisons de systèmes à base d’herbe ou d’ensilage de maïs, d’une race spécialisée (Holstein) ou mixte (Normande) et sur l’effet du niveau de production laitière par ACV attributionnelle. Quelle que soit la méthode d’attribution des impacts aux co-produits, les impacts par kg de lait ont été plus faibles pour les systèmes à base d’ensilage de maïs et pour les Holstein, sauf pour l’eutrophisation. L’accroissement de la production de lait par vache grâce à une consommation d’énergie accrue et au vêlage à 2 ans a permis de réduire les impacts du lait et de son co-produit viande. Les conséquences de la conversion d’une exploitation laitière utilisant beaucoup de maïs ensilage vers une exploitation utilisant de l’herbe comme unique source de fourrage pour répondre à une demande de lait produit à base d’herbe en France ont été évaluées par ACV conséquentielle. Cette conversion entraîne des changements notables de l’utilisation des sols en dehors de l’exploitation, et donc un fort accroissement des impacts du système dans son ensemble et du lait produit. / This thesis addresses the environmental impacts of cattle production systems. The first objective of this thesis was to analyse and compare the environmental impacts of suckler-beef and dairy production systems using attributional life cycle assessment (ALCA). Subsequently, the effects of mitigation practices for suckler-beef production systems were assessed. The second objective addressed methodology development by exploring possible consequences due to an increase in preference for grass-based milk using consequential LCA (CLCA).For a suckler-beef production system, enteric methane fermentation was the main contributor to the climate change impact, and grassland production contributed most to other impacts (cumulative energy demand, eutrophication, acidification and land occupation). The suckler cow-calf herd substantially contributed to the impacts of the suckler-beef system. The most effective mitigation practice for the suckler-beef production system was decreasing calving age from 3 to 2 years. The use of lipids rich in omega-3 fatty acids in ruminant diets did not substantially affect the impacts of the suckler-beef production system. Simultaneous application of several compatible practices can substantially mitigate the impacts of the suckler-beef production system. The application of certain practices (e.g. reducing ungrazed grass losses, fattening heifers not used for replacement and reducing calving age) reduced land occupation. Alternative uses for the “released land”, e.g. the introduction of forest to sequester C into biomass, seems promising. For dairy production systems, the assessment focused on a grass-based vs. maize-silage-based system, dual-purpose breed (Normande) vs. specialised breed (Holstein) and the effect of increasing milk yield per cow, using the ALCA approach. Independent of co-product handling methods, the impacts per kg of milk were lower with the maize-silage-based system and with Holstein cows (except for eutrophication). Increasing milk yield per cow by increasing feed energy intake and applying more intensive management (first calving at 2 years) decreased the impacts of milk and its beef co-product. The consequences of converting a maize-silage-based to a grass-based dairy farm in France to meet the increased domestic preference for grass-based milk were assessed using the CLCA approach. This farm conversion caused land-use change outside the dairy farm and thus substantially increased the impacts of the whole production system and the milk it produced.
507

Méthodologie d'éco-conception de procédés par optimisation multiobjectif et aide à la décision multicritère / Process eco-design methodology by multiobjective optimization and multicriteria decision making

Ouattara, Adama 18 July 2011 (has links)
Ce travail a pour objectif le développement d’une méthodologie de conception de procédés éco-efficaces, avec prise en compte simultanée de considérations écologiques et économiques lors de la phase de conception préliminaire de procédés chimiques. L’aspect environnemental est quantifié à travers l’utilisation d’un ensemble d’indicateurs selon les lignes directrices de concepts de développement durable. Le cadre conceptuel est basé sur une modélisation du procédé et de l’unité de production d’utilités, car l’impact environnemental d’un procédé est lié non seulement aux effluents directs du procédé, mais également à la consommation énergétique, l’effet du recyclage, de la conversion des matières premières … Dans ce but, le logiciel d’aide à la décision ARIANETM dédié à la gestion des utilités des unités de production (vapeur, électricité, eau …) et des effluents (CO2, SO2, NOx, etc..) a été couplé au modèle d’un procédé pour déterminer les besoins en énergies primaires et quantifier les émissions polluantes. Ces modèles ont ensuite été intégrés au sein d’une boucle d’optimisation multiobjectif, basée sur une variante d’un algorithme génétique multiobjectif de type NSGA-II (Non Sorted Genetic Algorithm). Le compromis entre les objectifs économiques et écologiques est illustré à travers la génération de fronts de Pareto. La sélection des meilleures solutions parmi cet ensemble est effectuée par utilisation de techniques d’analyse multicritère. L’exemple test bien connu du procédé de production de benzène par hydrodésalkylation du toluène (HDA) est revisité ici dans un mode multiobjectif pour illustrer l’utilité de l’approche pour trouver des solutions de conception économiques et écologiques. / This study aims at the development of a design methodology for eco-efficient processes, meaning that ecological and economic considerations are taken into account simultaneously at the preliminary design phase of chemical processes. The environmental aspect is quantified by using of a set of indicators following the guidelines of sustainability concepts. The design framework is based on a modelling approach considering both process and utility production units, since the environmental impact of a chemical process not only contains the material involved in the process but also the energy consumption, the effect of flow recycle, material conversion and so on... For this purpose, a decision support tool dedicated to the management of plant utilities (steam, electricity, water...) and pollutants (CO2, SO2, NOx, etc..), (ARIANETM package) was coupled to process modelling and used here both to compute the primary energy requirements of the process and to quantify its pollutant emissions. Both models were thus integrated in an outer multiobjective optimization loop, based on a variant of the so-called NSGA-II (Non Sorted Genetic Algorithm) multiobjective genetic algorithm. The trade-off between economic and environmental objectives is illustrated through the generation of Pareto fronts. The selection of the best design alternatives is performed through the use of multicriteria analysis. The well-known benchmark process for hydrodealkylation (HDA) of toluene to produce benzene, revisited here in a multi-objective mode, is used to illustrate the usefulness of the approach in finding environmentally friendly and cost-effective designs.
508

Risk, Oil Spills, and Governance: Can Organizational Theory Help Us Understand the 2010 Deepwater Horizon Oil Spill?

Cade, Evelyn 17 May 2013 (has links)
The 2010 BP Deepwater Horizon oil spill in the Gulf of Mexico awakened communities to the increased risk of large-scale damage along their coastlines presented by new technology in deep water drilling. Normal accident theory and high reliability theory offer a framework through which to view the 2010 spill that features predictive criteria linked to a qualitative assessment of risk presented by technology and organizations. The 2010 spill took place in a sociotechnical system that can be described as complex and tightly coupled, and therefore prone to normal accidents. However, the entities in charge of managing this technology lacked the organizational capacity to safely operate within this sociotechnical system.
509

A avaliação ambiental estratégica e o Projeto Etanol Verde Estratégico na bacia do rio Pardo- SP / Strategic environmental assessment and the Green Strategic Ethanol Project in the Pardo´s river basin- SP

Clemente, Gabriel Ferreira de Azevedo 16 October 2013 (has links)
A agricultura é considerada uma das atividades antrópicas ambientalmente mais impactantes, sejam esses impactos em âmbito econômico, social e ambiental. Acarreta, portanto, interferência nos meios natural e socioeconômico, tanto positivos quanto negativos. Destaca-se, no Brasil, o cultivo da cana-de-açúcar, que utiliza práticas consideradas impactantes em todo o seu ciclo agrícola e industrial. Com o objetivo de praticar os valores de sustentabilidade, o setor sucro-alcooleiro precisa incorporar a variável ambiental na tomada de decisão desde as etapas iniciais do planejamento, permitindo a construção de cenários preditivos que tornem as atividades humanas menos impactantes negativamente para os sistemas ambientais, econômicos e sociais. Com isso, fazer esforços no sentido de praticar o desenvolvimento sustentável. Assim, o presente trabalho avalia as possíveis contribuições do instrumento de política ambiental Avaliação Ambiental Estratégica - AAE - para o setor agrícola, tendo como referência o Projeto Ambiental Etanol Verde Estratégico (PAEVE), do Governo do Estado de São Paulo, tomando como estudo de caso da região da bacia do rio Pardo. Para tanto, após uma revisão bibliográfica internacional dos conceitos, procedimentos e resultados do uso do instrumento (AAE), com maior enfoque para os casos realizados na agricultura, são analisados os procedimentos utilizados para a elaboração do PAEVE como um plano setorial estratégico da cana-de-açúcar no estado de São Paulo, à luz dos procedimentos comumente utilizados em AAE, por meio de uma matriz de avaliação da qualidade, técnica SWOT e análise crítica. Posteriormente é utilizado Sistemas de Informações Geográfica para avaliar aspectos relacionados ao Zoneamento Agro Ambiental do PAEVE e seus condicionantes técnicos, tendo como estudo de caso a região da bacia do rio Pardo, no estado de São Paulo. Dentre os resultados, merece destaque a indicação dos procedimentos dos planos e programas relacionados ao setor agrícola sucro-alcooleiro que podem ser influenciados pela Avaliação Ambiental Estratégica a fim de endereçar a sustentabilidade ao processo decisório. / Agriculture is considered one of the most environmentally impacting human activities. These impacts are in the economic, social and environmental aspects. Therefore, it entails interference in the natural and socio-economic, both positive and negative issues. It stands out in Brazil the cultivation of sugar cane, which uses practices considered striking all along its life cycle. Aiming to incorporate the environmental variable into decision make since its initial stages of planning, an important task is to build predictive scenarios on sugarcane sector activities for a less harmful development into environmental, economic and social aspects. Thus, this study assesses the possible contributions of environmental policy instrument Strategic Environmental Assessment - SEA - for the agricultural sector, with reference to the Strategic Green Ethanol Project of São Paulo State, in a case study on Pardo´s river basin. To do so, it is established an international review of the use of the instrument, with greater focus on the cases used in agriculture. So, it is analyzed the procedures of Strategic Green Ethanol Project within a SEA framework, throughout a quality assessment matrix, SWOT and critical analysis. Its used Geographic Information System for evaluating aspects related to the Agro Ecological Zoning of Strategic Green Ethanol Project, its conditioning technical factors, having as case study the region of Pardo´s river basin, in the state of São Paulo, Among the results, deserves attention the indication of the procedures in plans and programs related to agricultural sector of sugarcane that could have beneficial influential of Strategic Environmental Assessment towards promoting sustainable development into the decision making.
510

Ocupação humana e transformação da paisagem na Amazônia brasileira / Human settlement and landscape transformation in the Brazilian Amazon

Lui, Gabriel Henrique 11 November 2008 (has links)
Poucos ambientes terrestres deixaram de sofrer algum nível de interferência humana. As populações pré-históricas tiveram um papel importante na formação de determinadas paisagens e, como conseqüência, suas ações contribuíram para as características das paisagens atuais. Na Amazônia, tais transformações antropogênicas são inferidas por indícios de: (1) queimadas; (2) assentamentos; (3) ilhas de florestas manejadas; (4) diques em formatos geométricos; (5) terra preta; (6) campos elevados; (7) redes de transporte e comunicação; (8) estruturas para manejo da água e da pesca; entre outros. A partir da colonização européia no século XVI, a ocupação humana na região começou a receber novas influências. As relações com os recursos naturais estabelecidas pelas populações pré-colombianas foram muito pouco consideradas. A introdução de novas ferramentas e o choque cultural provocado pelos colonizadores alterou o nível de mobilização da energia do meio para as atividades produtivas humanas, ocasionando mudanças nos modos de vida das populações. A partir de meados do século XX, a implantação dos programas institucionais de colonização deu origem a uma nova motivação para a transformação das paisagens, pela qual a extração dos produtos florestais passou a ser uma atividade secundária, para dar lugar a uma lógica de supressão da floresta para introdução de novos elementos, que seriam produzidos para atender a um contexto externo. Além disso, o espaço passou a ser delimitado em propriedades privadas, que só seriam reconhecidas em função da supressão da floresta para dar início às atividades produtivas. Dessa forma, houve um crescimento exponencial na escala espaço-temporal das transformações das paisagens. Por meio da complementação e do confronto das perspectivas evolutivas, históricas e sociais, o presente trabalho se propôs a caracterizar as diferentes dinâmicas de ocupação nas paisagens amazônicas. O período estudado abrange desde a chegada do ser humano até os dias de hoje, buscando entender como o desenvolvimento da organização social e das tecnologias foi capaz de modificar as paisagens no passado e como o faz atualmente. Os dados foram analisados em função de um seqüenciamento temporal. Três dinâmicas de ocupação distintas foram caracterizadas e nomeadas em função dos diferentes níveis de transformação da paisagem, ao longo dos contextos históricos do período de estudo: Dinâmica da Diversificação (9000 a.C. e 1600 d.C.); Dinâmica da Simplificação (1600 d.C. e 1960 d.C.) e Dinâmica da Supressão (a partir de 1960 d.C.). Como uma das conclusões, assumiu-se que o conceito de paisagem depende da existência de dois elementos: natureza e humanidade. Enquanto esses dois elementos coexistirem, a paisagem sempre estará presente, independente de suas qualidades. Dessa forma, nos 11000 anos de convivência entre a humanidade e a floresta amazônica, não foi a sustentabilidade da paisagem que foi ameaçada e sim a sustentabilidade das próprias sociedades que dependem dela. Esse complexo cenário ecológico, social e econômico ao qual a Amazônia está atualmente submetida, tem como principal característica a presença de 85% das áreas ainda em bom estado de conservação. Tal proporção confere ao Brasil a responsabilidade de desenvolver novas técnicas de gestão ambiental que considerem as especificidades regionais, combinando o desenvolvimento econômico do país com a conservação da mais importante floresta tropical do mundo. / In this planet, very few environments are free from anthropogenic disturb. The prehistoric populations used to play significant roles for the formation of some kind of landscapes; the consequences of their actions contributed to the present landscape characteristics. At the Amazon, these transformations are inferred from anthropogenic vestiges, such as: (1) burned areas in the forest; (2) human settlements; (3) managed forest islands; (4) geometrical ditches; (5) dark soils; (6) raised fields; (7) transportation and communication networks; (8) water and fish management structures; among others. The established ways of natural resources uses by pre- Columbian population were looked to down since European colonization in the sixteenth century. The introduction of new tools and cultural shock given by European settlers changed the level of energy necessary to human productive activities, changing the population ways of life. From the middle of the twentieth century, the diffusion of institutional settlement programs led to new motivations for landscape transformation, through which the extraction of forest products has become secondary activity, and give rise to a logic of forest suppression and introduction of new production lines to external context. Furthermore, the land was delimited as private properties, which would only be recognized after forest removal in order to start productive activities. Therefore, there was an exponential growth in space-time scale of landscape transformations. Through complementation and interface among evolutionary, historical and social perspectives, this work has proposed to characterize the different settlement dynamics in the Amazon landscapes, since the arrival of human beings up to now, in order to understand how the development of social organization and technologies was able to change the landscapes in the past, and how they do it today. The data were analyzed as a temporal sequencing. Three distinct settlement dynamics were characterized and nominated considering different levels of landscape transformation, along the historical contexts of the studied periods in this work: (1) Dynamic of Diversification (9000 BC to 1600 AD); (2) Dynamic of Simplification (1600 AD to 1960 AD); and (3) Dynamic of Suppression (from 1960 AD on). A conclusion was assumed that landscape concept depends on the existence of two elements: nature and mankind. While these two elements coexist, the landscape will always be present, despite their characteristics. Thus, in 11000 years of coexistence between mankind and Amazon forest it was not threatened the landscape sustainability, but the sustainability of the societies themselves. This complex ecological, social and economical situation which Amazon is currently undergoing has as main characteristic the presence of 85% of this area in good conservation conditions. Such ratio gives to Brazil the responsibility to develop new environmental management techniques that consider the regional specificities, matching sustained economic development of the nation and conservation of the most important tropical forest of the world.

Page generated in 0.0658 seconds