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Introduction

Long misunderstood by the general public as an elementary field limited to drawing boundaries and memorizing capital cities, contemporary geography exhibits, in contrast, a fecund, robust, and increasingly sophisticated understanding of the world. Previously confined to the margins of academia and earning little respect, geography in the past four decades has been decisively transformed into an innovative and dynamic field that has earned the respect, even the admiration, of scholars in the sciences, humanities, and social sciences.

Literally “earth description” (geo-graph), geography may broadly be defined as the art and science of understanding the space of Earth's surface. At its simplest, geography studies the locations of things and the explanations that underlie spatial distributions of different types. Fundamentally, geographers ask “Why are things where they are?” Now, such a wide definition obscures the enormous diversity of the discipline and the multiple meanings of space itself. Space may mean, for example, the biophysical surface of Earth, an arena of class confrontation, or an intangible set of meanings. Geography is notorious, even infamous, for its eclecticism and for the very wide range of topics that it addresses. Not only do geographers tackle a great span of issues, but they do so from a multitude of theoretical and conceptual angles. Some fear that this diversity robs the discipline of a central narrative: At first glance, quantitative geomorphologists and feminist deconstructivists might seem to share little in common. Moreover, geographers approach their issues from an astonishingly diverse set of conceptual perspectives, ranging from complex mathematical models and geographic information systems (GIS) to post-structuralist discourse analysis. Geography speaks with more than one voice, which is part of the key to its growing contemporary popularity and vitality. The various ways in which space can be understood will be discussed in more detail below.

The Rising Popularity of Geography Today

The surge in geography's popularity today reflects much more than its own internal intellectual metamorphosis. Profound forces at work throughout the world have made geographical knowledge increasingly important to understanding numerous human dilemmas and our capacity to address them. Four of these are emphasized here: (1) globalization, (2) environmental destruction, (3) new geospatial technologies, and (4) cyberspace.

Globalization

Contrary to much received opinion, globalization—that complex set of often contradictory processes that operate at a transnational scale—has made geographical location more, not less, relevant. As neoliberal capital operates ever more effortlessly on a worldwide stage, small differences among regions become increasingly important. The persistent inequality between the global North and South, that is, the world's economically developed and underdeveloped regions, as well as continuing war and famine have drawn many people's attention to the role of space in perpetuating, and at times challenging, such problems. Moreover, far from simplistic and naive assertions about the “death of distance” or the “end of geography,” place has become increasingly central to the behavior of transnational corporations, trade, immigration, tourism, and global financial flows. Discourses of national competitiveness in a global economy thrive as place-centered ways of coping with increasingly mobile capital, which operates on a worldwide scale. Opposition to globalization, including terrorism, has also increased the importance of learning about other cultures. At a moment when more than half the human race lives in cities, questions of how urban areas are interconnected (or not) loom large, as does the need for an understanding of deeply geographical issues such as rural-to-urban migration. Rising inequality worldwide speaks to processes that have disproportionately favored the elites at the expense of the working classes and the poor. For many people, matters of social justice are thus inescapably spatial ones. Increasingly, what happens in one part of the world has important ramifications in other parts—a fundamentally geographic phenomenon. Moreover, globalization itself plays out in different ways in different places, so that the global and the local are deeply entangled with one another.

Contemporary globalization has also undermined commonly held notions of absolute, Euclidean space by forming linkages among disparate producers and consumers intimately connected over vast distances through flows of capital, information, and goods. In generating new landscapes twisted like origami and filled with wormholes, in giving rise to ever-changing patterns of centrality and peripherality, the tsunami of globalized timespace compression has forced many people to recognize that geographies are always and everywhere dynamic, incomplete, forever coming into being, and perpetually in flux. The period of rapid globalization in the late 20th and early 21st centuries was accompanied, not coincidentally, by an explosion of theoretical work in human geography, in which the discipline firmly came to view space as a social construction, embedded in its historical context and filled with political and cultural meanings. The relational perspective on the world's landscapes today, which depicts them in terms of flows, rhizomes, and networks, is a far cry from the archaic study of places as discrete, bounded, and isolated and has played a large role in electrifying human geography.

Environmental Destruction

Another patently obvious role that geography plays today concerns the rapidly rising seriousness of global ecological and environmental problems. Issues that once could be understood and contained within relatively localized contexts, such as air or water pollution, are increasingly approachable only on a worldwide basis. Acid rain crosses national borders with ease. The enormous crisis of biodiversity unfolding across the world is inseparable from global patterns of population growth, habitat destruction, deforestation, desertification, soil erosion, and resource consumption. The oceans have been confronted with systematic over-fishing and coastal pollution, including agricultural runoff and chemical spills. As protection and preservation of the environment have risen on the political agenda, geographers’ work in these domains has gained attention accordingly. Hazards, such as the devastating Indian Ocean tsunami of 2004, have drawn the attention of worldwide audiences. The 2010 earthquake in Haiti triggered a response from millions around the globe. Combating global transmissions of diseases, such as AIDS, entails a geographical understanding of their genesis and diffusion. Limited global supplies of resources, including petroleum, have helped elevate the notion of the limits to growth in popular consciousness.

And of course, looming over all these issues is the dark shadow of global warming: As evidence mounts daily of rapidly melting ice caps and glaciers, of rising sea levels and more extreme weather events, of ecosystems turned upside down overnight and mass extinctions, the origins, impacts, and control of greenhouse gases have become increasingly problematic issues. Because environmental issues are unevenly distributed across space and because geography as a discipline has a long history of investigating humanenvironment interactions, space and spatiality have become crucial dimensions in understanding and tackling these problems.

Geospatial Technologies

Geography and cartography have always been close cousins, and for many people, mapping is their first entry into the world of spatial analysis. As technologies for surveying, mapping, and monitoring Earth's surface have proliferated in number, accuracy, and sophistication, geographical awareness about Earth's surface, both popular and academic, has grown correspondingly. Geospatial technologies, including GIS, global positioning systems (GPS), remote sensing, and location-based services, have infiltrated many corners of everyday life. Many cars and cell phones today have them. The enormous flood of data that such techniques have generated have allowed geographers to study the world's social and environmental issues in novel ways, testing models and hypotheses, enhancing forecasting abilities, and attracting widespread attention and enthusiasm. Increasingly, mapping has become not the preserve of an isolated elite group of experts but a popular activity, in which users create their own displays uniquely suited to their own contexts and problems. More people today create, disseminate, and use larger volumes of geographic information than ever before. Novel quantitative approaches (e.g., spatial autocorrelation) have supplemented the ability to understand spatial patterns in new and fecund ways. Indeed, many people would argue that such techniques form the engine that drives the growth of much academic geography. The engagement between human geographers and practitioners of GIS has opened fertile new fields to explore, including neogeography, humanistic GIS, and Web 2.0 mashups.

Cyberspace

Finally, the rise of cyberspace and the Internet has also elevated issues of spatiality in several ways. The Internet, an unregulated electronic network connecting an estimated 1.7 billion people (or 26% of the planet) in 2009, allows users to transcend distance virtually instantaneously. Telecommunications systems have become the central technology of postmodern capitalism, vital not only to corporations but also to individual consumption, communication, entertainment, education, politics, and numerous other domains of social life. As Internet usage becomes more popular and widespread in nature, including diverse applications such as e-mail, online shopping, banking, airline and hotel reservations, multiplayer video games, electronic job searches, instant messaging, e-marketing, chat rooms, VOIP telephony, distance education, downloading of music and television shows, digital pornography, blogs, YouTube and MySpace, and simply “Googling” of information, cyberspace has profound effects on social relations, everyday lives, culture, politics, and many other spheres of social activity. Indeed, for many people who spend a great deal of time in the digital world, cyberspace has become such an important part of everyday life that the once solid boundary between the real and the virtual has essentially dissolved: It is difficult today to tell where one ends and the other begins. In allowing people and firms to “jump scale,” to connect effortlessly with others around the world at the click of a mouse, cyberspace has been instrumental in the production of complex, fragmented, jumbled spaces of postmodernity.

There are, of course, many other reasons why geography remains important. Shortages of resources including water as well as a dwindling oil supply have intensified competition for the remaining stocks. The world's oceans are being emptied of their food reserves and are suffering ecosystem collapse at dizzying rates. Massive, ongoing technological changes have led to a proliferation of new industries, occupations, and products, even as old ones disappear. Knowing where one is located is vital to knowing one's identity, and as spaces have been reconfigured, so, too, have individual and collective notions of self and the other. Poverty-stricken populations the world over have spoken out against the causes of their oppression and made their voices heard. Concerns over distant strangers have multiplied as geographical imaginations have expanded in the face of rising long-distance social and personal relations and media coverage. In short, in a world in which the future arrives all too soon, whenever larger numbers of people must daily contend with questions of difference, when nature repeatedly inserts itself into the news, matters of geography have become not a luxury but a necessity.

The Multiple Meanings of Space

One reason for the diversity of geographical knowledges is that space has many dimensions and can be understood in widely different ways.

Space as a Biophysical Landscape

Space as the biophysical surface of the Earth is one such dimension. For physical geographers, Earth's surface has traditionally been seen as a set of atmospheric, hydrologic, biological, and geomorphologic processes. Biogeographers focus on the spatial distribution of life forms, as evolutionary forces have generated webs of ecological relations that vary enormously over time and space. Many physical geographers traditionally paid little attention to human dynamics and often felt that they had more in common with their intellectual brethren in geology, biology, or meteorology than they did with fellow geographers. Conversely, for many human geographers, the natural environment has amounted, at best, to a set of resources. However, the schism between physical and human geography is gradually closing, and increasingly, physical geographers have come to recognize that social activities must be taken seriously, just as many human geographers have slowly come to see that social relations do not simply unfold over a blank surface but are intensely wrapped up with a complicated natural terrain that exhibits a complex logic in its own right. Just as human geographers have grudgingly come to accept that the biophysical world does play an important role in shaping the distributions of human activity, so too have many physical geographers gradually acknowledged that nature does not simply exist outside society but is shaped by human beings and given meaning only within a variety of social contexts.

Space as Places That People Create and Inhabit

A second way in which space may be approached is as a set of places that people create and inhabit. Human geography—the analysis of how societies are stretched over Earth's surface—is thus the study of people in space in much the same way as history views people in time. Indeed, because space and time are inseparable, historical and geographical analyses are necessarily fused. Thus, human geography includes the study of how societies construct places, how different types of activities (cultural, economic, and political) are differentially located and connected, and how all these constantly change, with important ramifications for their inhabitants’ quality of life. Regional geographers have long been interested in the specific conjunctions of processes in individual locales, and the creative tension between understanding the unique and the general continues to reverberate throughout the discipline, as it has for centuries. The generation and transformation of human geographies occur at a variety of spatial scales, and scale has become important not only to cartographers but also to those seeking to understand how different social processes play out at different scales, ranging from the local to the global. Indeed, scale itself has widely become viewed as a human product. Some geographers focus on the most personal and intimate of scales, the body: While bodies appear as “natural,” or given, human geographers view them as social constructions, filled with gendered, racialized, and other meanings. Increasingly, as globalization has linked the planet's diverse societies into an increasingly integrated totality, it has become impossible to separate the local from the global. Integral to this perspective are questions regarding how people use the surface of the Earth, modify it, and in turn are affected by it. The interrelations between people and nature are a longstanding and hugely important part of the discipline. As the ties between human and physical geography have grown, many have rejected the long-standing notion that nature lies “outside” social relations; rather, everywhere, nature has been changed by people and been given meaning by them, even as it changes societies, a notion well encapsulated by relatively recent approaches such as political ecology.

Space as Representation of Earth's Surface

Third, space exists as a set of representations of Earth's surface, the most literal meaning of geo-graph. Geography is concerned with much more than the tangible worlds of mountains or factories, rivers or farms; it also includes the study of how people bring the world into consciousness, make sense of it, and give it meaning. Cartography, for example, is perhaps the most common way in which geographical knowledge has been constructed throughout its history. Maps of one form or another date back deep into human prehistory, when hunters and gatherers formed their own symbolic geographies. Voluminous, detailed, often encyclopedic descriptions of the locations of places are another form of geographical representation.

Shortly after World War II, many geographers adopted the scientific method; using quantitative techniques, they initiated a tradition of modeling space that continues to this day. Geographical models take a diversity of forms and serve many different purposes, ranging from traffic planning to watershed analysis. Models are central to many academic and nonacademic applications of geography, as they simplify the dynamics of the world to reveal its causal properties. This tradition was greatly assisted by the rise of GIS, which allow for the integration and analysis of diverse forms of spatial information. Often integrated with remotely sensed high-altitude or satellite photography, GIS has become a hugely popular, powerful, and important part of the discipline.

In stark contrast, other geographers approached the question of spatial representation in a dramatically different way. The behavioral tradition explored mental maps and cognitive models of space. Humanistic geographers, drawing on a rich philosophical tradition of existentialism and phenomenology, are concerned with the textures of human experience, the role of language and discourse, and how individual understandings are wrapped up with social configurations of power and knowledge. Discourse analysis, which lies at the core of contemporary poststructuralist approaches, insists that geographic knowledges are always social in origin and social in consequence and thus inevitably linked to power interests.

A Very Brief Historical Sketch

Geography has a long, rich, and fascinating history. For any society to exist, it must create a landscape, and its geography is central to how it is organized and changes. Thus, as long as there have been human beings, there have been human geographies.

The history of geography is important because all ideas, including geographical ones, are embedded within and reflect their historical contexts. For example, classical Greek geography, which included both encyclopedic descriptions and mathematical treatises, reflected the location of city-states at the intersections of Africa, Asia, and Europe and the trade relations that sutured them together. In the medieval era, European geography labored under the yoke of theological suppression, and its intellectual development suffered according. Conversely, Arab geographers were among the world's best, skilled in mapping and providing rich portrayals of the places strewn throughout the Muslim ecumene.

During the Renaissance and Enlightenment, periods in which European empires extended their tentacles across the planet and the “West” as we know it began to come into being, cartography grew explosively—a testimony to geography's long history of service to imperial interests. Exploration and geography have long been tied together, but geography was vital in mapping the world's resources and understanding the diverse peoples falling under the tsunami of colonialism.

In the late 19th century, infected by a racist and unscientific form of Darwinism, geography in the form of environmental determinism was widely used to justify and naturalize colonial inequalities. Geopolitics became a central part of colonial rivalries, and political geography made its first appearance. Finally, new strains such as anarchist geography made their appearance. Simultaneously, geography became institutionalized within academia, with a variety of professional organizations and university departments.

In the early 20th century, retreating from the disaster of environmental determinism, geographers entombed themselves within empty empiricist descriptions—an era that continues to haunt the discipline's public image today. In this paradigm, the region, untheorized and taken for granted, ruled as the core of the geographer's craft. However, cultural geographers, such as Carl Sauer, paved the way for new understandings of landscapes as social creations, infusing the discipline with historical sensitivity.

Following World War II, scientific cartography was born. Armed with statistics and an enthusiasm for the scientific method, the quantitative revolution decisively transformed the field, offering a concern for methodological rigor, models, and conceptual abstraction. Physical geography, drawing on 19th-century roots, expanded into quantitative climatology, geomorphology, and biogeography.

The late 20th century and the current era gradually witnessed an intellectual renewal, which took various forms. Diverse schools of thought rejuvenated human geography, such as Marxism, feminism, humanistic thought, and, more recently, poststructuralism and postcolonialism. The discipline exhibited mounting methodological sophistication, including GIS, remote sensing, and quantitative modeling. Work concerned with the social construction of nature and humanenvironment relations began to heal the long-standing schism between human and physical geographers. Understandings of natural hazards, anthropogenic climate change, complexity theory, contingency and path dependency, gender, everyday life, race and ethnicity, Eurocentrism, sexuality, class, power, and uneven development proliferated. Long a borrower of ideas from other fields, geography today has experienced a renaissance that has made it increasingly interesting to nongeographers, as exemplified by the “spatial turn” widespread throughout the social sciences and humanities.

A Note on This Project

This encyclopedia sets for itself an ambitious task: to offer a reasonably comprehensive and useful summary of the state of the discipline in the early 21st century. As geographical knowledge has exploded in quantity, diversity, and sophistication, many people, including students and the informed lay public, find it difficult to know where to turn. This project attempts to fill that gap. No single project, of course, can do justice to the gargantuan amount of information that characterizes any discipline today; at best, it can hope only to trace the broad contours. Thus, readers should not expect the entries to attempt a comprehensive portrait of their topics; space limitations have forced the authors to focus only on the most important aspects of their respective essays. With 1,224 entries, the encyclopedia encapsulates an enormous diversity of topics in all subdisciplines. Cross-references at the end of each entry point to the innumerable connections among them, which, in conjunction with the suggestions for further readings, allow all readers to pursue topics as deeply as they wish. Because a picture is worth a thousand words, many entries are accompanied by art and graphics that lend depth and realism to the text. In addition to the more than 900 pieces of art in the A-to-Z entries, the encyclopedia includes an atlas with maps, found in the last volume.

To assist readers in locating relevant topics, the Reader's Guide at the beginning of Volume 1 decomposes geography into the six broad subject areas listed below. While the ones used here are relatively conventional, it should be noted that there are as many ways to organize geographical knowledge as there are geographers. (Indeed, geography is such a notoriously diverse and broad discipline that any categorization of it is bound to offend someone.) Note, too, that many topics defy easy categorization and belong to more than one grouping.

  • Physical Geography
    • Biogeography
    • Climatology
    • Geomorphology
  • Human Geography
    • Economic Geography
    • Geographical Theory
    • Medical Geography
    • Political Geography
    • Regional Geography
    • Social and Cultural Geography
    • Urban Geography
  • Nature and Society
    • Agriculture
    • Environment and People
    • Hazards and Disasters
    • Pollution and Waste
    • Resources and Conservation
    • Water
  • Methods, Models, and GIS
    • Cartography
    • GIS
    • Qualitative Techniques
    • Quantitative Models
    • Remote Sensing
  • History of Geography
    • Cartography
    • GIS
    • Human Geography
    • Physical Geography
  • People, Organizations, and Movements
    • Biographies
    • Geographical Organizations
    • Political and Economic Organizations
    • Scientific Organizations
    • Social Movements

Acknowledgments

This work is dedicated to all geographers, wherever they may be, past, present, and future.

A multivolume encyclopedia is such a large and complex undertaking that it demands the time and energy of a large number of people. So many people have contributed to this project that it is impossible to name them all. All I can do here is give my heartfelt thanks to all of those responsible for bringing these six volumes into being.

First, the bulk of the credit lies with the authors—all 942 of them, from dozens of countries—of the 1,224 entries, who agreed to write on their respective topics, often under short deadlines, revised their contributions as necessary, corrected me when I was wrong, and often came up with a wonderful array of graphics. Their works reveal the richness, diversity, and sophistication of contemporary geography, and I learned more from reading their contributions—1.78 million words—than I can put into words. I thank you all.

Second, the associate editors of this venture played an enormously valuable strategic role. Piotr Jankowski handled the GIS and cartography entries with aplomb; Barry Solomon rounded up a large number of skilled authors to write great essays on human-environmental relations; Mark Welford collected excellent physical geography entries with admirable grace; and Jonathan Leib, working quietly behind the scenes, served as an effective managing editor.

Third, the staff at SAGE demonstrated the utmost professionalism, working far beyond the call of duty. Rolf Janke and Robert Rojek served as acquisitions editors and made this encyclopedia possible. Diana Axelsen deserves special merit for her extraordinarily thorough review of each and every entry and helpful feedback. Among numerous other coordinators, assistants, copy editors, and graphics specialists who deserve a round of applause are Laura Notton, Yvette Pollastrini, Tracy Buyan, Eileen Gallaher, Leticia Gutierrez, Rebecca Johnson, Sheri Gilbert, and Shamila Swamy. Their meticulous assessment of all the contributions, identification of errors, suggestions for improvement, and patient corrections greatly improved the appearance and quality of the entire encyclopedia. There are many others who also lent a hand, and their work is much appreciated.

All these parties, with thousands of e-mails and often enduring drudgery, have worked tirelessly to produce a product of which they, and I, can be justly proud.

BarneyWarf
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