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Human Geography: Nature and Scope | CBSE Class 12 Geography Notes

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This note covers the meaning and scope of human geography, relationships between nature and human societies, technology, environmental determinism, possibilism, neo-determinism, changing geographical approaches, major schools of thought, and links between human geography and other social sciences.

What does human geography study?

Human geography studies relationships between the natural world and the human world. It examines the spatial distribution of human phenomena, how these distributions develop, and social and economic differences between different parts of the world.

Its concern is therefore wider than a description of people or places. It connects human life with the spaces in which it occurs. Physical surroundings, human activities and differences between places are considered together.

How is it connected with geography as a whole?

Geography is integrative, empirical and practical. Its reach includes events and phenomena that vary across space and time. Its central concern is understanding the earth as the home of human beings and examining the elements that sustain them.

The earth includes the physical environment and life forms, including human beings. Physical geography concentrates on the physical environment, while human geography considers relationships involving human societies. These areas of study remain closely connected because humans and nature interact.

Definition: Human geography examines the interrelationship between the physical environment and the socio-cultural environment that human beings create through their interactions with nature.

How do the major definitions differ in emphasis?

GeographerCentral idea in the definitionEmphasis
RatzelA synthetic study of the relationship between human societies and the earth's surface.Synthesis, or considering the relationship together.
Ellen C. SempleThe relationship between active, changing humanity and an unstable earth.Dynamism in the human-earth relationship.
Paul Vidal de la BlacheA conception arising from combined knowledge of the earth's physical laws and relationships among its living beings.Interrelationships between the earth and human beings.

These definitions direct attention towards relationships. Ratzel highlights synthesis, Semple highlights change, and Vidal de la Blache connects physical laws with living beings. They help explain why human geography brings human and natural processes into a shared field of study.

Why should nature and human beings be understood together?

The physical environment includes landforms, soils, climate, water, natural vegetation, and diverse flora and fauna. It provides the resources and setting within which human activities take place. Human life is therefore connected with physical conditions.

The socio-cultural environment includes features created through human activity. Houses, villages, cities, road and rail networks, industries, farms, ports and objects of daily use are examples of material culture produced using resources from the physical environment.

How does influence operate in both directions?

Human beings greatly modify their physical surroundings. At the same time, those surroundings affect human lives. The relationship involves mutual interaction: people act upon nature, and natural conditions influence the circumstances within which people live and work.

AspectExamplesConnection
Physical environmentLandforms, soils, climate and water.Provides conditions and resources for human activities.
Living components of natureNatural vegetation and diverse flora and fauna.Form part of the environment with which human societies interact.
Human-created environmentHouses, farms, industries, ports and transport networks.Develops through the use and modification of physical resources.

What debates have shaped geography?

Geography has experienced debates about whether it should develop laws and theories or describe particular phenomena. The law-making approach is called nomothetic; the descriptive approach is called idiographic. Regional and systematic approaches have also been debated.

Another debate concerns theoretical interpretation and a historic-institutional approach. These debates do not justify treating physical and human geography as completely separate. Nature and humans are inseparable elements, so a holistic view considers their connections.

Geographical language also uses comparisons with human anatomy: the face of the earth, eye of a storm, mouth of a river, snout of a glacier, neck of an isthmus and profile of soil. Transport networks are described as arteries of circulation.

Regions, villages and towns have been described as organisms, while German geographers have compared the state or country to a living organism. These expressions accompany the broader idea that natural and human worlds are intricately interwoven.

How does technology shape human interaction with nature?

Technology helps human beings interact with the physical environment. Understanding what people produce is useful, but understanding the tools and techniques used in production is especially important. Technology indicates the level of a society's cultural development.

Technology develops through improved knowledge of natural laws. Human beings do not gain this capacity by ignoring nature. They use their understanding of natural processes to develop tools and techniques that loosen environmental constraints.

Which examples show the importance of natural knowledge?

KnowledgeTechnological connection
Friction and heatUnderstanding these concepts helped humans discover fire.
DNA and geneticsUnderstanding these helped humans overcome many diseases.
AerodynamicsIts laws are used to develop faster aircraft.

Each example connects knowledge of nature with a human capability. Fire, advances against disease and faster aircraft illustrate different uses of natural understanding. Together, they explain why technology occupies a central place in the relationship between society and environment.

How does greater understanding create possibilities?

  1. People develop a better understanding of their environment and the forces of nature.
  2. Social and cultural development supports the development of better and more efficient technology.
  3. People use this technology with resources obtained from the environment to create possibilities.
  4. Human activities leave their imprint on the environment, producing a cultural landscape.

This movement is described as a shift from necessity towards freedom. It explains the increasing ability to modify surroundings. It does not mean that natural conditions disappear or that environmental limits can safely be ignored.

Note: Technological development depends on knowledge of nature. Improved tools can reduce constraints, while the resources used and the natural laws involved continue to matter.

The degree of technological development helps explain the contrast between naturalisation of humans and humanisation of nature. With limited technology, people are strongly influenced by natural conditions; with improved techniques, they can make greater changes to their surroundings.

What are environmental determinism and the naturalisation of humans?

In the early stages of interaction between humans and their environment, natural conditions strongly influenced human life. Technology was at a very low level, and social development was at an early stage. People adapted closely to the demands of nature.

Definition: Environmental determinism describes interaction in which the strong forces of nature greatly influence human societies with very limited technological development.

Naturalisation of humans expresses this close adaptation and dependence. A naturalised human listens to nature, fears its destructive power and worships it. Nature supplies resources that directly sustain the household and community.

Case study: Benda and the naturalisation of humans

Benda lives in the Abujh Maad area of central India. His village consists of three huts in the forest. His community practises shifting cultivation, clearing small patches by burning vegetation and using the ash to make the soil fertile.

Mahua, Palash and Sal trees form part of Benda's surroundings. He drinks water from a stream and thanks Loi-Lugi, the spirit of the forest. Leaves and roots also appear in his direct use of forest resources.

Benda and his friends collect Gajjhara and Kuchla, special plants used by their people. These are needed for barter at the madhai, or tribal fair. Knowledge passed on by elders helps him recall the plants and where they grow.

What does Benda's example explain?

The example joins material dependence with respect for nature. Cultivation, water, gathered plants and inherited knowledge connect everyday life with the forest. Nature is a powerful presence that is revered, worshipped and conserved.

The physical environment becomes Mother Nature for societies with this direct dependence. Benda's activities illustrate why naturalisation concerns a whole relationship with the environment, including resources, beliefs and ways of living, rather than simply living near trees.

His example should be linked to the conditions of limited technology and strong environmental influence. The central geographical idea is the close dependence of a household on nature for the resources that sustain it.

How do possibilism and humanisation of nature explain cultural landscapes?

As societies gain knowledge and develop more efficient technology, people create new possibilities from environmental resources. Possibilism emphasises that nature provides opportunities and human beings make use of them. This process gradually places human imprints on the natural world.

Humanisation of nature means that the environment increasingly bears the marks of human endeavour. The landscape reflects human activity as people use resources, build structures, cultivate land and develop connections between places.

What is a cultural landscape?

Definition: A cultural landscape is the landscape created through human activities, carrying the visible imprint of human use and modification of the environment.

These imprints appear in many settings. Health resorts occur on highlands, while fields, orchards and pastures occur in plains and rolling hills. Ports occupy coasts, routes cross oceans, and satellites extend human activity into space.

SettingHuman imprint
HighlandsHealth resorts.
Plains and rolling hillsFields, orchards and pastures.
CoastsPorts.
Ocean surfaceOceanic routes.
SpaceSatellites.

Large urban sprawls also express the human transformation of surroundings. These examples show the breadth of cultural landscapes, which include cultivated areas, settlements, transport connections and other results of human effort.

How does this differ from naturalisation?

Naturalisation highlights strong environmental influence over people with limited technology. Humanisation highlights the growing ability to create possibilities through environmental knowledge and technological development. Both ideas concern the relationship between people and nature, but their emphasis differs.

Nature still supplies the opportunities and resources used in creating these landscapes. Possibilism therefore connects human initiative with environmental possibilities. Improved techniques help people move beyond close dependence on immediate natural conditions and reshape their surroundings.

The relationship is dynamic because both human capabilities and landscapes change. Cultural development, better technology and the use of resources work together in this explanation of how the environment acquires the imprint of human activity.

How does Kari's life illustrate the humanisation of nature?

Case study: Kari in Trondheim

Winters in Trondheim bring fierce winds, heavy snow and skies that remain dark for months. Kari's daily routine illustrates how technology helps people overcome constraints associated with such harsh conditions.

Kari drives to work in darkness at 8 am. Her car has special winter tyres, and she keeps its headlights switched on. These details connect transport technology with the practical conditions of winter travel.

Her office is artificially heated to 23 degrees Celsius. The university campus where she works is built under a large glass dome. The dome keeps snow out in winter and allows sunshine to enter in summer.

Which facilities modify her immediate surroundings?

SituationTechnology or facilityRole in Kari's routine
Driving to work in darkness at 8 am.Special winter tyres and headlights.Support her journey under winter conditions.
Working in an office at 23 degrees Celsius.Artificial heating.Provides a comfortable indoor temperature.
Snow in winter and sunshine in summer.A large glass dome.Keeps snow out and admits summer sunshine.

Temperature and lighting are carefully controlled. Kari keeps an orchid on her desk, even though fresh vegetables and plants do not grow in the harsh outdoor weather described. Her immediate environment is therefore substantially modified.

Bananas and kiwi are flown in regularly from warmer areas. Computer connections allow Kari to communicate with colleagues in New Delhi. She can take a morning flight to London and return in the evening.

What geographical relationship does the example reveal?

Technology connects Kari with resources and people beyond her immediate surroundings while also modifying indoor conditions. Heating, the dome, transport and communication together make her lifestyle possible despite severe winter conditions.

The comparison with Benda concerns different relationships with nature. Benda depends directly on forest resources and adapts closely to his surroundings. Kari uses developed technology to overcome several immediate constraints. The examples illustrate naturalisation and humanisation through everyday activities.

How does neo-determinism balance opportunities with environmental limits?

Griffith Taylor introduced neo-determinism, also called stop and go determinism. It offers a middle path between environmental determinism and possibilism. It rejects both absolute necessity and absolute freedom in the relationship between people and nature.

The central idea is that human beings can overcome natural constraints by obeying natural conditions. Development may proceed where nature permits modification, while possibilities should be created within limits that do not damage the environment.

How does the traffic-light comparison work?

Traffic signalMeaningConnection with the idea
RedStop.People must respond to environmental limits.
AmberGet set during the interval between red and green.The comparison includes a pause between stopping and proceeding.
GreenGo.Development can proceed when nature permits modification.

The comparison illustrates conditional freedom. People have scope to act, but the environment sets limits. Unrestricted action is not presented as a safe route to development, just as unrestricted traffic movement would bring accidents.

Why are limits necessary?

The unrestricted course attempted by developed economies is associated with the greenhouse effect, ozone layer depletion, global warming, receding glaciers and degrading land. These environmental problems show why development cannot be treated as a completely free pursuit.

Neo-determinism attempts to balance human initiative with environmental constraints. It moves beyond an either-or choice between total control by nature and complete human freedom. Its emphasis is on possibilities that remain compatible with environmental limits.

Note: Stop and go determinism permits development within natural limits. It does not mean that all development must stop, or that improved technology removes the need to respect the environment.

To distinguish the approaches, connect determinism with strong natural influence, possibilism with opportunities created through human effort, and neo-determinism with a balance between action and restraint. Their different emphases explain contrasting interpretations of the same broad human-environment relationship.

How have the approaches to human geography changed over time?

Human geography has developed through approaches with different purposes and methods. Its broad stages move from exploration and regional description towards analysis of differences, spatial patterns, human concerns and local contexts.

What are the broad stages and their main concerns?

PeriodApproachPrincipal concern
Early Colonial periodExploration and description.Imperial and trade interests encouraged discovery; accounts gave encyclopaedic descriptions of areas.
Later Colonial periodRegional analysis.Detailed study of all aspects of regions helped explain the earth as a whole.
1930s through the inter-War periodAreal differentiation.Identifying a region's uniqueness and explaining how and why it differed from others.
Late 1950s to the late 1960sSpatial organisation.Using computers and statistical tools to identify mappable patterns in human activities.
1970sHumanistic, radical and behavioural schools.Responding to dissatisfaction with the dehumanised character of quantitative geography.
1990sPost-modernism in geography.Questioning universal theories and giving importance to each local context.

Regional analysis sought detailed knowledge of regions because understanding the parts would help explain the whole earth. Areal differentiation focused more specifically on the uniqueness of a region and the reasons it differed from other regions.

What was the quantitative revolution?

The phase of spatial organisation used computers and sophisticated statistical tools. Laws of physics were often applied to map and analyse human phenomena. The main objective was to identify patterns of human activities that could be mapped.

This phase was called the quantitative revolution. Dissatisfaction with its dehumanised manner of studying geography helped bring humanistic, radical and behavioural approaches to prominence in the 1970s, making the subject more relevant to socio-political realities.

Post-modernism questioned grand generalisations and the applicability of universal theories to human conditions. It emphasised understanding local contexts in their own right. This changed the emphasis from broadly applicable explanations towards the particular circumstances of places.

How do humanistic, radical and behavioural schools differ?

The humanistic, radical and behavioural schools emerged amid dissatisfaction with the quantitative revolution. They made human geography more relevant to social and political realities, while placing emphasis on different aspects of human life.

What does each school emphasise?

SchoolMain emphasisAssociated concerns
Welfare or humanisticPeople's social well-being.Housing, health and education.
RadicalMarxian explanations of poverty, deprivation and social inequality.The relationship between contemporary social problems and capitalism.
BehaviouralLived experience and perception of space.Social categories based on ethnicity, race and religion.

The welfare or humanistic school was mainly concerned with aspects of social well-being. Housing, health and education illustrate the conditions it placed at the centre of geographical attention.

The radical school used Marxian theory to explain the basic causes of poverty, deprivation and social inequality. Its explanation related contemporary social problems to the development of capitalism.

The behavioural school emphasised lived experience and the perception of space. It considered social categories based on ethnicity, race and religion, drawing attention to how space is experienced and perceived.

How can the distinctions be kept clear?

Associate humanistic geography with well-being, radical geography with explanations of inequality through Marxian theory, and behavioural geography with lived experience and spatial perception. These associations separate their main concerns without treating them as identical responses to quantitative geography.

All three helped bring human concerns into sharper focus. However, concern for housing and health is different from explaining social problems through capitalism, and both differ from examining perceptions of space. A clear comparison preserves these differences in emphasis.

What is the scope of human geography and how does it link with other disciplines?

Human geography explains relationships between elements of human life and the space over which they occur. This broad concern makes it interdisciplinary. It develops close links with other social sciences to understand human elements on the earth's surface.

As knowledge expands, new sub-fields emerge. Fields such as social, urban, political, population, settlement and economic geography connect geographical study with different aspects of human life and with related bodies of knowledge.

Which major fields connect with which disciplines?

FieldRelated discipline
Social GeographySocial sciences, especially Sociology.
Urban GeographyUrban Studies and Planning.
Political GeographyPolitical Science.
Population GeographyDemography.
Settlement GeographyUrban and Rural Planning.
Economic GeographyEconomics.

What are the social and political sub-fields?

Sub-fieldRelated discipline or disciplines
Behavioural GeographyPsychology.
Geography of Social Well-beingWelfare Economics.
Geography of LeisureSociology.
Cultural GeographyAnthropology.
Gender GeographySociology, Anthropology and Women's Studies.
Historical GeographyHistory.
Medical GeographyEpidemiology.
Electoral GeographyPsephology.
Military GeographyMilitary Science.

The social sub-fields include studies of behaviour, well-being, leisure, culture, gender, history and health. Electoral and military geography appear as sub-fields of political geography. Their links illustrate how specialised geographical study connects with sister disciplines.

What are the economic sub-fields?

Sub-fieldRelated discipline or disciplines
Geography of ResourcesResource Economics.
Geography of AgricultureAgricultural Sciences.
Geography of IndustriesIndustrial Economics.
Geography of MarketingBusiness Studies, Economics and Commerce.
Geography of TourismTourism and Travel Management.
Geography of International TradeInternational Trade.

These links express the wide scope of human geography. The subject draws on related disciplines while keeping attention on human life in space. Its fields bring social, political, population, settlement and economic concerns into geographical enquiry.

Glossary

  • Human geography — Study of relationships between the natural and human worlds, including the spatial distribution of human phenomena.
  • Physical environment — Natural surroundings comprising landforms, soils, climate, water, vegetation, and diverse flora and fauna.
  • Socio-cultural environment — Environment created by human beings through their activities and interactions with the physical world.
  • Technology — Tools and techniques through which human beings interact with their physical environment.
  • Environmental determinism — An interpretation emphasising strong natural influence over human societies with very limited technological development.
  • Naturalisation of humans — Close adaptation of human life to nature under conditions of limited technology and direct environmental dependence.
  • Possibilism — An interpretation emphasising opportunities provided by nature and used by humans through their activities.
  • Humanisation of nature — The process through which nature increasingly bears the imprint of human endeavour and modification.
  • Cultural landscape — A landscape created by human activities through the use and modification of the environment.
  • Neo-determinism — A middle path allowing human development within natural limits that prevent damage to the environment.
  • Areal differentiation — An approach identifying a region's uniqueness and explaining how and why it differs from others.
  • Spatial organisation — An approach using statistical tools and computers to identify mappable patterns of human activities.
  • Quantitative revolution — The phase of geographical study marked by computers, sophisticated statistics and analysis of spatial patterns.
  • Nomothetic approach — An approach concerned with making laws or developing theories within geographical study.
  • Idiographic approach — A descriptive approach within debates about the nature and purpose of geographical study.

Common errors and misconceptions

  • Misconception: Human geography concerns people without reference to nature. Correct: It studies relationships between the physical environment and the human world, including spatial distributions and social and economic differences.
  • Misconception: Physical and human geography describe entirely separate worlds. Correct: Nature and human beings are inseparable and require a holistic understanding.
  • Misconception: Technology develops independently of natural knowledge. Correct: Understanding natural laws helps people develop tools and techniques, as illustrated by fire, genetics and aerodynamics.
  • Misconception: Naturalisation and humanisation mean the same process. Correct: Naturalisation emphasises close adaptation to nature; humanisation emphasises the imprint of human activity on nature.
  • Misconception: Neo-determinism either forbids development or allows unrestricted development. Correct: It permits development within environmental limits and balances opportunities with constraints.
  • Misconception: Humanistic, radical and behavioural geography have identical concerns. Correct: Their respective emphases are well-being, Marxian explanations of inequality, and lived experience and spatial perception.
  • Misconception: Regional analysis and areal differentiation have the same emphasis. Correct: Regional analysis describes regions comprehensively; areal differentiation identifies regional uniqueness and explains differences.
  • Misconception: Spatial organisation and quantitative revolution are unrelated. Correct: The phase associated with spatial organisation, computers and statistical analysis was called the quantitative revolution.

Exam-style questions with model answers

Q1. Define human geography and state its central relationship. [2 marks]
  1. Human geography studies relationships between the natural and human worlds and the spatial distribution of human phenomena.
  2. Its central concern includes interaction between the physical environment and the socio-cultural environment created by human beings.
Q2. Why is technology important in human-environment interaction? [3 marks]
  1. Human beings use technology to interact with their physical surroundings. Tools and techniques influence how resources are used and what people can create.
  2. Technology develops through understanding natural laws. Knowledge of friction and heat helped humans discover fire, while aerodynamics supports faster aircraft.
  3. Improved technology loosens environmental constraints and helps people create possibilities from resources obtained from nature.
Q3. Explain naturalisation of humans using Benda's example. [5 marks]
  1. Naturalisation describes close adaptation to nature when technological development is very limited and natural forces strongly influence human life.
  2. Benda lives in the Abujh Maad area of central India. His community practises shifting cultivation, burning small forest patches and using the ash to improve soil fertility.
  3. He depends directly on forest resources and stream water. He and his friends collect plants needed for barter at the madhai or tribal fair.
  4. His thanks to Loi-Lugi, the forest spirit, show reverence for nature. Knowledge received from elders helps guide the collection of plants.
  5. The example joins direct resource dependence with respect for powerful natural forces. It illustrates a relationship in which the environment is regarded as Mother Nature.
Q4. Distinguish environmental determinism, possibilism and neo-determinism. [5 marks]
  1. Environmental determinism emphasises the strong influence of natural forces on societies with very limited technology. People adapt closely to nature, illustrating the naturalisation of humans.
  2. Possibilism emphasises opportunities provided by nature and used through human effort. Better knowledge and technology help people create cultural landscapes, illustrating the humanisation of nature.
  3. Neo-determinism, introduced by Griffith Taylor, takes a middle path between absolute necessity and absolute freedom. It is also called stop and go determinism.
  4. Its traffic-light comparison explains that people must stop at environmental limits and proceed where nature permits modification. Human possibilities exist, but development should remain within limits that avoid environmental damage.
Q5. How does Kari's life illustrate humanisation of nature? [3 marks]
  1. Kari lives in Trondheim, where winter brings snow, fierce winds and prolonged darkness. Special winter tyres and headlights support her journey to work.
  2. Artificial heating maintains her office at 23 degrees Celsius. A glass dome keeps snow out and lets sunshine enter, while temperature and lighting are controlled.
  3. Air transport brings fruit from warmer areas, and computers connect her with colleagues elsewhere. These technologies help overcome immediate environmental constraints.
Q6. Explain the main differences among the humanistic, radical and behavioural schools. [3 marks]
  1. The welfare or humanistic school concerns social well-being, including housing, health and education.
  2. The radical school uses Marxian theory to explain poverty, deprivation and social inequality, relating contemporary social problems to the development of capitalism.
  3. The behavioural school emphasises lived experience and the perception of space by social categories based on ethnicity, race and religion. The schools emerged amid dissatisfaction with dehumanised quantitative geography.
Q7. Explain the scope and interdisciplinary character of human geography. [5 marks]
  1. Human geography examines relationships between elements of human life and the spaces where they occur. Its broad scope creates links with sister disciplines in the social sciences.
  2. Social geography connects with sociology. Its specialised sub-fields include behavioural, cultural, gender, historical and medical geography, which draw on related areas of knowledge.
  3. Urban geography connects with urban studies and planning. Settlement geography links with urban and rural planning, while population geography links with demography.
  4. Political geography connects with political science and includes electoral and military geography. Economic geography connects with economics.
  5. Economic sub-fields include resources, agriculture, industries, marketing, tourism and international trade. New sub-fields develop as knowledge expands, extending the subject's interdisciplinary reach.
Q8. What did spatial organisation and post-modernism emphasise? [3 marks]
  1. Spatial organisation, prominent from the late 1950s to the late 1960s, used computers and sophisticated statistics to identify mappable patterns of human activities.
  2. This phase was called the quantitative revolution, and laws of physics were often applied to analyse human phenomena.
  3. Post-modernism in the 1990s questioned grand generalisations and universal theories, emphasising the need to understand each local context in its own right.

Key takeaways

  • Human geography connects the natural and human worlds, examining spatial distributions and social and economic differences between places.
  • Nature and human beings interact closely, so physical and human geography require a connected, holistic understanding.
  • Technology develops through knowledge of natural laws and helps people create possibilities from environmental resources.
  • Naturalisation emphasises direct dependence and close adaptation to nature, illustrated by Benda's forest-based life.
  • Humanisation describes the imprint of human activities on nature, illustrated by cultural landscapes and Kari's technologically supported routine.
  • Neo-determinism balances opportunities with environmental limits, permitting development where nature allows modification without environmental damage.
  • Geographical approaches have emphasised exploration, regions, differences, spatial patterns, human concerns and the importance of local contexts.
  • Human geography is interdisciplinary, linking its social, political, population, settlement, urban and economic fields with related disciplines.

Test yourself

Which aspect of human geography did Ratzel emphasise?

Ratzel emphasised synthesis in studying the relationship between human societies and the earth's surface.

What is the key emphasis in Ellen C. Semple's definition?

Semple emphasised dynamism, describing a changing relationship between active humanity and an unstable earth.

How do the terms naturalisation and humanisation differ?

Naturalisation describes close adaptation and dependence on nature. Humanisation describes nature increasingly bearing the imprint of human activities.

Who introduced stop and go determinism, and what does it permit?

Griffith Taylor introduced it. It permits development within natural limits, balancing human opportunities with the need to avoid environmental damage.

Which school used Marxian theory to explain social problems?

The radical school used Marxian theory to explain poverty, deprivation and social inequality.

What is the difference between areal differentiation and spatial organisation?

Areal differentiation explains regional uniqueness and differences. Spatial organisation identifies mappable patterns of human activities using computers and statistical tools.

Which disciplines link with population, medical and electoral geography?

Population geography links with demography, medical geography with epidemiology, and electoral geography with psephology.

Why does human geography develop new sub-fields?

As knowledge expands, new sub-fields emerge to study aspects of human life and their relationships with space.