This book aims at illustrating several examples of different membrane compositions ranging from inorganic, polymeric, metallic, metal organic framework, and composite which have been successfully deployed to separate industrially relevant gas mixtures including hydrogen, nitrogen, methane, carbon dioxide, olefins/parafins among others. Each book chapter highlights some of the current and key fundamental and technological challenges for these membranes that must be overcome in order to envision its application at industrial level.

The world's freshwater resources are coming under growing pressure through such environmental hazards as human waste, urbanization, industrialization, and pesticides. The problems are exacerbated through drought in many parts of the world. The improvement of the water quality itself and access to it have been major concerns for politicians and development agencies for over a decade. First officially formulated at the Rio Earth Summit of 1992, they have been restated or expanded since then. The UN Millennium Declaration of 2000 transformed general guidelines into specific targets. The international community pledged "to halve by 2015 the proportion of people who are unable to reach, or to afford, safe drinking water" and "to stop the unsustainable exploitation of water resources, by developing water management strategies at the regional, national and local levels, which promote both equitable access and adequate supplies." Thus, ten years after Rio it is time to take stock. Based on the collective inputs of 23 United Nations agencies and convention secretariats, this Report offers a global overview of the state of the world's freshwater resources. It is part of an on-going assessment process to develop policies and help with their implementation as well as to measure any progress towards achieving sustainable use of water resources. Generously illustrated with more than 25 full-color global maps and numerous figures, the report reviews progress and trends and presents seven pilot case studies of river basins representing various social, economic and environmental settings: Lake Titicaca (Bolivia, Peru); Senegal river basin (Senegal, Mali, Mauritania, Guinea); Seine Normandy (France); Lake Peipsi/Chudskoe (Estonia, Russia); Ruhuna basin (Sri Lanka); Greater Tokyo region (Japan); and Chao Phraya (Thailand). It assesses progress in 11 challenge areas, including health, food, environment, shared water resources, cities, industry, energy, risk management, knowledge, valuing water and governance. Proposing methodologies and indicators for measuring sustainability, it lays the foundations for regular, system-wide monitoring and reporting by the UN, together with the development of standardized methodologies and data. With its comprehensive maps, glossary, references and coverage of a broad range of themes and examples of real-world river basins, the UN World Water Development Report will no doubt prove to be a most valuable reference work. Visit the United Nation's Water Portal for more information on the report and on the International Year of Freshwater 2003.

Traces the development of the structure of the Road Commission and describes how Alaska's road system grew from less than a dozen miles of wagon road shortly after the turn of the century, to a network of 10,000 miles of roads by the time the Commission went out of existence in 1956.

Geographic Thought An accessible and engaging introduction to geographic thought In the newly expanded Second Edition of Geographic Thought: A Critical Introduction, renowned scholar Tim Cresswell delivers a thoroughly up-to-date and accessible examination of the major thinkers and key theoretical developments in the field. Coverage of the complete range of the development of theoretical knowledge—from ancient geography to contemporary theory—appears alongside treatments of the influence of Darwin and Marx, the emergence of anarchist geographies, the impact of feminism, and myriad other central bodies of thought. This latest edition also includes new chapters on physical geography and theory, postcolonialism and decoloniality, and black geographies. The author emphasizes the importance of geographic thought and its relevance to our understanding of what it means to be human and to the people, places, and cultures of the world in which we live. This new edition contains: New examples throughout consisting of contemporary research from a wider range of geographical contexts and by geographers from diverse backgrounds Comprehensive explorations of physical geography that combine updated coverage from the first edition with brand new material Updated discussions of spatial science and quantitative methods that include considerations of the role of place and specificity in quantitative work In-depth examinations of the Anthropocene, the uses of assemblage theory, and the emergence of the GeoHumanities. Perfect for students of undergraduate and graduate courses in geographic thought, Geographic Thought: A Critical Introduction will also earn a place in the libraries of students and scholars researching the history and philosophy of geography, as well as practicing geographers.