Brief History of Human Civilization

An information society is a society in which the creation, distribution and use of information is the main economic, social and cultural activity, and most people work with information rather than producing goods. It began in developed countries after about the 1960s–70s with computers and grew rapidly with the internet from the 1990s.

Characteristics of information society

• Information as main resource – knowledge and data, not land or machines, are the key source of wealth and power.
• Knowledge workers – most jobs are in services: IT, banking, education, health, research, media.
• ICT everywhere – computers, internet, mobile phones and cloud services connect people and businesses.
• Globalisation – instant communication, global trade, outsourcing and e-commerce.
• Networked, flexible work – remote work, gig economy, flexible hours.
• Fast change and innovation – short product life, lifelong learning needed.
• Digital divide – gap between those who have access and skills and those who do not.
• New problems – privacy, cyber crime, misinformation, information overload.

How industrial society entered into information society

1. Saturation of manufacturing – after World War II, factories in developed countries became highly automated; fewer workers were needed to produce goods, and labour moved to services.
2. Electronics revolution – the transistor (1947), integrated circuit (1958) and microprocessor (1971) made computers small and cheap.
3. Computers in business and government – mainframes and later personal computers (1980s) took over record keeping, banking, design and control.
4. Telecommunication and the internet – satellites, optical fibre, ARPANET (1969), the World Wide Web (1991) and mobile phones linked the world.
5. Growth of the service sector – finance, insurance, education, health, media and software grew larger than manufacturing in GDP and employment.
6. Education and research – mass higher education produced knowledge workers; R&D became a key investment.
7. Globalisation – industries shifted factories to low-wage countries while rich countries kept design, finance and information work.
8. Government policy – deregulation of telecom, investment in IT infrastructure and digital governance.

Agricultural  -->  Industrial  -->  Information
 (land,labour)    (machines,      (knowledge,
                   capital)        ICT, data)
                  ~1760-1950      ~1970 onward

The transition was not sudden: industry still exists, but information technology now controls and adds value to it (e.g. automated, computer-controlled factories).

World War II (1939–1945) was fought between the Allies (Britain, France, USSR, USA, China) and the Axis powers (Germany, Italy, Japan). It was the deadliest and most destructive war in history and reshaped the world.

Economic impacts

• Huge destruction – cities, factories, railways and farms in Europe, USSR, Japan and China were destroyed; large debts and inflation followed.
• USA as economic superpower – US industry was untouched and grew; the US dollar became the world's main currency (Bretton Woods system, 1944).
• New economic institutions – International Monetary Fund (IMF) and World Bank (1944); GATT (1947), later WTO.
• Marshall Plan (1948) – US aid rebuilt Western Europe; rapid recovery of Germany and Japan later followed.
• Technology spin-offs – radar, jet engine, computers, nuclear energy, antibiotics (penicillin mass production) and synthetic materials moved into civilian industry.
• Welfare state and planned economies – Britain and others started social security; Eastern Europe adopted Soviet-style planning.

Social impacts

• Massive loss of life – about 70–85 million deaths, including about 6 million Jews in the Holocaust.
• Refugees and migration – millions displaced; partition and population transfers.
• Women in the workforce – women took factory jobs during the war, which advanced women's rights.
• Human rights – Universal Declaration of Human Rights (1948); Geneva Conventions (1949).
• Baby boom after the war and growth of the middle class, mass education and consumer culture.

Political impacts

• United Nations (1945) formed to keep peace.
• Cold War – the world split into two blocs: USA-led (NATO, 1949) and USSR-led (Warsaw Pact, 1955); arms race and nuclear threat.
• Decolonisation – weakened European powers lost colonies: India and Pakistan (1947), Indonesia, and most of Africa by the 1960s.
• Division of Germany and Korea; Israel created (1948); Communist victory in China (1949).
• Decline of Britain and France as great powers; rise of USA and USSR as superpowers.

The two world wars, World War I (1914–1918) and World War II (1939–1945), changed the political map, economy, technology and culture of the world.

Impact of World War I

• About 15–20 million deaths; Europe's economy weakened and debts grew.
• Fall of four empires: German, Austro-Hungarian, Ottoman and Russian; new nations formed in Europe.
• Russian Revolution (1917) led to the first communist state.
• Treaty of Versailles (1919) punished Germany harshly, which later helped cause WWII.
• League of Nations formed (1920).
• Technology: tanks, aircraft, submarines, chemical weapons, radio.
• Women entered factories; many countries gave women the vote after the war.

Impact of World War II

• About 70–85 million deaths, Holocaust, huge destruction.
• United Nations (1945), IMF and World Bank formed.
• USA and USSR became superpowers; Cold War and nuclear arms race began.
• Decolonisation of Asia and Africa (India 1947 and many others).
• Technology: radar, jet engine, rockets, nuclear energy, electronic computers, penicillin.
• Marshall Plan rebuilt Europe; welfare states and human rights (UDHR 1948) grew.

Population explosion is a very rapid and large increase of human population in a short time, when the birth rate stays high but the death rate falls sharply. World population was about 1 billion in 1800, 2.5 billion in 1950 and passed 8 billion in November 2022; most of this growth happened after 1950, mainly in developing countries.

Reasons for population explosion

1. Fall in death rate – better medicine, vaccines, antibiotics and control of epidemics (smallpox, cholera, plague).
2. Better food supply – Green Revolution, high-yield seeds, fertilisers and irrigation reduced famine.
3. Improved sanitation and safe water – lower infant and child mortality.
4. Increased life expectancy – more people live to old age.
5. High birth rate – early marriage, low use of contraception, desire for sons, children seen as labour and old-age security.
6. Illiteracy and poverty – especially low education of women.
7. Religious and cultural beliefs against family planning.

This is explained by the demographic transition model: stage 1 high birth and death rates; stage 2 death rate falls but birth rate stays high (explosion); stage 3 birth rate falls; stage 4 both low.

View on the current trend of decreasing population in developed countries

Many developed countries such as Japan, South Korea, Italy, Germany and East European countries have a total fertility rate below the replacement level of about 2.1, and their populations are shrinking or ageing. My view:

• Causes: high cost of living and child-rearing, women's education and careers, late marriage, easy contraception, urban lifestyle and individualism.
• Positive side: less pressure on resources and environment, more investment per child, higher living standard.
• Negative side:
  • Ageing population – fewer workers support more retired people; pension and health costs rise.
  • Labour shortage – slower economic growth and less innovation.
  • Empty villages and schools, smaller consumer market.
• Responses: incentives for child birth, child care and parental leave, higher retirement age, automation and robotics, and immigration of workers (which also affects countries like Nepal through foreign employment).

So the trend is a natural result of development (stage 4 of demographic transition). It is not harmful by itself, but it must be managed with balanced policies; meanwhile the global challenge remains high growth in poorer countries.

The Renaissance ("rebirth") was the cultural and intellectual revival in Europe from about the 14th to the 16th century (roots in the 13th century), beginning in Italian city-states such as Florence and Venice and spreading across Europe. It revived the learning of ancient Greece and Rome and marked the change from the Middle Ages to the modern age. It shifted thinking from blind faith and authority to human reason, observation and experiment, which laid the base for science and technology.

Artistic innovation

• Artists studied nature and the human body closely; linear perspective, anatomy, light and shade made art realistic.
• Leonardo da Vinci combined art with engineering: sketches of flying machines, bridges, pumps and anatomy.
• Michelangelo and Brunelleschi (dome of Florence Cathedral) used geometry and new construction methods.
• Art thus trained people in careful observation and measurement, the basic habits of science.

Humanism

• Humanists (Petrarch, Erasmus) put human ability, reason and dignity at the centre instead of only religion.
• Revival of Greek and Latin texts; education in grammar, history, mathematics and philosophy.
• Encouraged questioning of the Church's authority and individual thinking, leading to the Reformation (1517).

Scientific inquiry

• Printing press by Gutenberg (about 1440) spread books and ideas quickly and cheaply.
• Copernicus (1543) proposed the Sun-centred universe; Galileo used the telescope and experiments; Kepler gave the laws of planetary motion.
• Vesalius (1543) corrected human anatomy by dissection.
• Francis Bacon and others promoted the experimental (scientific) method.
• Navigation tools (compass, astrolabe) supported voyages of discovery (Columbus 1492, Vasco da Gama 1498).

Together, art, humanism and inquiry produced the Scientific Revolution of the 16th–17th centuries (Newton, 1687) and later the Industrial Revolution, moving the world towards scientific and technological progress.

The Renaissance ("rebirth") was the cultural and intellectual revival in Europe from about the 14th to the 16th century (roots in the 13th century), beginning in Italian city-states such as Florence and Venice and spreading across Europe. It revived the learning of ancient Greece and Rome and marked the change from the Middle Ages to the modern age.

Major drivers of the European Renaissance

1. Growth of trade and cities – after the Crusades, trade with Asia and the Middle East made Italian cities (Venice, Genoa, Florence) rich; a merchant class arose.
2. Wealthy patrons – families like the Medici of Florence and the Popes paid artists, scholars and architects.
3. Rediscovery of classical learning – Greek and Roman texts preserved by Arab and Byzantine scholars came to Italy; after the fall of Constantinople (1453) Greek scholars fled to Italy with manuscripts.
4. Printing press (Gutenberg, c. 1440) – made books cheap and spread new ideas widely.
5. Humanism – a new philosophy valuing human reason, individual ability and worldly life.
6. Decline of feudalism and Church authority – the Black Death (1347–1351) killed a third of Europe, raised wages, weakened feudal lords and shook faith in the Church.
7. Contact with other civilisations – Arab science, Indian numerals (via Arabs), Chinese inventions (paper, compass, gunpowder).
8. Universities and education – centres such as Bologna, Padua and Paris trained scholars.
9. Geographical discoveries – new sea routes brought wealth and new knowledge.

The Renaissance ("rebirth") was the cultural and intellectual revival in Europe from about the 14th to the 16th century (roots in the 13th century), beginning in Italian city-states such as Florence and Venice and spreading across Europe. It revived the learning of ancient Greece and Rome and marked the change from the Middle Ages to the modern age.

Causes: growth of trade and rich Italian city-states, patronage (Medici family), rediscovery of Greek and Roman texts (especially after the fall of Constantinople, 1453), invention of the printing press (Gutenberg, c. 1440), and the weakening of feudalism and Church after the Black Death.

Main features:

• Humanism – focus on human reason, dignity and worldly life.
• Realistic art – perspective and anatomy (Leonardo da Vinci, Michelangelo, Raphael).
• Science – Copernicus (Sun-centred theory), Galileo, Kepler, Vesalius; experiment and observation.
• Literature in local languages – Dante, Shakespeare.
• Exploration – Columbus, Vasco da Gama.

Effects: Reformation, Scientific Revolution, spread of education, rise of nation-states, and the foundation of the Industrial Revolution and modern civilisation.

The Renaissance ("rebirth") was the cultural and intellectual revival in Europe from about the 14th to the 16th century (roots in the 13th century), beginning in Italian city-states such as Florence and Venice and spreading across Europe. It revived the learning of ancient Greece and Rome and marked the change from the Middle Ages to the modern age. The 13th to 15th centuries are called the Great Renaissance or intellectual revival of Europe because in this period Europe woke up from the "Dark Ages", when learning was controlled by the Church and feudal lords, and moved towards reason, art, science and discovery.

Why these centuries are called the Great Renaissance

1. Revival of classical knowledge – Greek and Roman works of Plato, Aristotle, Euclid and Ptolemy were translated from Arabic and Greek; scholars fleeing Constantinople (1453) brought manuscripts to Italy.
2. Humanism – Petrarch (14th century) and others stressed human dignity, reason and worldly life instead of only life after death.
3. Questioning of authority – people started to question the Church's control over knowledge, preparing the way for the Reformation (1517).
4. Growth of universities – Bologna, Paris, Oxford, Padua grew as centres of free learning.
5. Printing press (c. 1440) – Gutenberg's movable-type press made books cheap; literacy and new ideas spread fast.
6. Art and architecture – realistic painting with perspective (Giotto, Masaccio, later Leonardo), domes and buildings based on geometry (Brunelleschi).
7. Literature in common languages – Dante's Divine Comedy, Boccaccio, Chaucer wrote in local languages, bringing learning to ordinary people.
8. Early science and observation – Roger Bacon (13th century) stressed experiment; interest in anatomy, astronomy and mathematics grew; Hindu-Arabic numerals spread.
9. Trade and wealth – the Crusades and trade with the East made Italian cities rich; merchants and patrons (Medici) funded scholars and artists.
10. Decline of feudalism – the Black Death (1347–51) caused labour shortage, higher wages and a weaker feudal order, freeing people's minds and mobility.
11. Age of exploration begins – better ships, compass and maps led to voyages in the late 15th century (Columbus 1492).

Because of this all-round revival of thought, art, science and economy, which became the base of the Scientific and Industrial Revolutions, the 13th–15th centuries are called the Great Renaissance or intellectual revival of Europe.

The Renaissance ("rebirth") was the cultural and intellectual revival in Europe from about the 14th to the 16th century (roots in the 13th century), beginning in Italian city-states such as Florence and Venice and spreading across Europe. It revived the learning of ancient Greece and Rome and marked the change from the Middle Ages to the modern age. It is rightly called the foundation for Europe's move from an agricultural (feudal) society to an industrial society, because it changed people's thinking, knowledge and economy.

How the Renaissance prepared the industrial society

1. Change in mindset – humanism replaced blind faith with reason; people believed they could understand and control nature.
2. Scientific method – Copernicus, Galileo, Kepler and later Bacon and Newton developed observation, experiment and mathematics, which later gave the steam engine and machines.
3. Spread of knowledge – the printing press (c. 1440) spread technical books and ideas; literacy rose.
4. Trade and capital – growth of trade, banking (Medici bank), and merchants created capital that could later be invested in factories.
5. Geographical discoveries – new sea routes and colonies supplied raw materials (cotton) and markets for goods.
6. Decline of feudalism – peasants became free labourers and moved to towns, giving the workforce that factories needed.
7. Technical innovations – better mills, clocks, mining, metallurgy and navigation tools built engineering skills.
8. Reformation and work ethic – encouraged hard work, saving and enterprise.

Renaissance --> Scientific Revolution --> Industrial
(13th-15th c)   (16th-17th c)            Revolution
 reason,art     experiment, laws         (~1760 Britain)
 printing       Newton, Galileo          steam, factories

Thus, the knowledge, capital, labour, markets and scientific attitude created during and after the Renaissance made it possible for Britain and Europe to start the Industrial Revolution around 1760.

Civilisation is an advanced stage of human society with settled life, cities, government, writing, division of labour, science and culture. It is "enlightened" when people replace ignorance, superstition and blind authority with knowledge, reason, science, education and humane values. This happened in Europe during the Renaissance and the Age of Enlightenment (17th–18th century: Newton, Locke, Voltaire, Rousseau).

How civilisation can be enlightened

• Spread of education and literacy to all.
• Use of reason and scientific method instead of superstition.
• Freedom of thought, speech and press; respect for human rights and democracy.
• Use of technology for welfare, with ethics ("science with humanity").
• Equality of gender, caste and class; rule of law.
• Protection of the environment and culture.

Agricultural society vs industrial society

How industrial societies entered into information society

1. Automation reduced factory jobs, and labour shifted to services.
2. Transistor, IC and microprocessor made cheap computers.
3. Computers and telecommunication (satellite, optical fibre, internet, mobile) spread information instantly.
4. Knowledge, software and data became the main source of wealth.
5. Higher education produced knowledge workers; R&D grew.
6. Globalisation moved manufacturing abroad while rich countries kept information work.

Information society thus has knowledge as its key resource, networked organisations and ICT in every sector.

The Stone Age is the earliest and longest period of human history, when people mainly used tools made of stone, together with wood and bone. It began about 2.5–3 million years ago and ended when metal (copper and bronze) came into use, around 3000 BC in many regions.

Divisions of the Stone Age

Key points

• Tools and technology: from crude stone choppers to polished axes, needles and sickles; fire for warmth, cooking and protection.
• Economy: hunting and gathering, later farming (Neolithic Revolution).
• Society: small bands and tribes, sharing of food, division of work by age and sex.
• Culture: burial of the dead, cave art (Lascaux, Bhimbetka), beliefs in nature spirits.
• Significance: the Neolithic Revolution created surplus food, settled villages and later cities, leading to the river valley civilisations (Mesopotamia, Egypt, Indus) of the Bronze Age.

The Industrial Revolution was the change from hand production to machine and factory production that began in Britain around 1760 and spread to Europe and the USA in the 19th century. It used coal-powered steam engines and mechanised industries.

Major technological developments (initial Industrial Revolution, about 1760–1840)

1. Textile machines – flying shuttle (John Kay, 1733), spinning jenny (Hargreaves, 1764), water frame (Arkwright, 1769), spinning mule (Crompton, 1779), power loom (Cartwright, 1785); cotton gin (Whitney, 1793).
2. Steam engine – Newcomen engine (1712) pumped water from mines; James Watt's improved steam engine (1769) powered factories, mills and later transport.
3. Iron and steel – coke smelting (Abraham Darby, 1709), puddling process (Henry Cort, 1784); later the Bessemer process (1856) for cheap steel.
4. Coal mining – coal replaced wood and water as the main energy source.
5. Transport – canals, better roads (McAdam), steam locomotive (Stephenson's Rocket, 1829) and railways; steamships.
6. Machine tools – lathes and standard parts allowed mass production.
7. Communication – electric telegraph (1830s–40s).

How the Industrial Revolution led to major environmental issues

1. Air pollution – burning coal released smoke, soot and SO₂; cities like London and Manchester suffered heavy smog (later the Great Smog of London, 1952, killed about 4,000+ people).
2. Climate change – burning fossil fuels raised atmospheric CO₂ from about 280 ppm before 1750 to over 420 ppm today, causing global warming.
3. Water pollution – factories dumped dyes, chemicals and waste into rivers (Thames "Great Stink" of 1858); sewage from crowded towns spread cholera and typhoid.
4. Deforestation and land degradation – forests cut for timber, charcoal and farmland; mining scarred the land.
5. Resource depletion – rapid use of coal, iron ore and later oil.
6. Acid rain – SO₂ and NOₓ emissions damaged forests, lakes and buildings.
7. Urbanisation problems – slums, solid waste, poor sanitation and noise.
8. Loss of biodiversity – habitat destruction and pollution.

Coal + steam --> factories, railways --> more coal
      |                                    |
   smoke, CO2, SO2                    mining waste
      v                                    v
 smog, acid rain,                 land and water
 global warming                   pollution

Thus the Industrial Revolution brought great economic growth but also began most of today's environmental problems, which later led to environmental laws, cleaner technologies and the idea of sustainable development.

The Industrial Revolution was the shift from hand-made, home-based production to machine-based factory production, which started in Britain around 1760 and spread to Europe, the USA and Japan in the 19th century.

Causes (why Britain first): availability of coal and iron, capital from trade and colonies, colonies as markets and raw material sources, agricultural revolution freeing labour, scientific progress, stable government and patent laws.

Main inventions: spinning jenny (1764), Watt's steam engine (1769), power loom (1785), coke smelting of iron, steam locomotive (1829), railways and steamships.

Effects:

• Economic: mass production, growth of trade, capitalism and the factory system.
• Social: urbanisation, rise of the working class and middle class, child labour, slums, later labour laws and trade unions.
• Political: colonialism and imperialism to secure raw materials and markets.
• Environmental: coal smoke and smog, water pollution, deforestation, rising CO₂ and the start of climate change.

The Industrial Revolution changed the agricultural society into an industrial society and laid the foundation for modern technology and the later information society.

An information society is a society in which creating, storing, sharing and using information is the main economic and social activity; knowledge is the key source of wealth and power, and most people work in information and service jobs using ICT (computers, internet, mobile phones).

Characteristics: information as the main resource, knowledge workers, ICT in all sectors, globalisation, networked and flexible work, rapid innovation, lifelong learning, and new problems such as the digital divide, cyber crime and loss of privacy.

How agricultural society entered into information society

Human society passed through three main stages.

Hunting-gathering     stone tools, nomadic
       |
       v
Agricultural          ~10,000 BC: plough, land
       |
       v
Industrial            ~1760: steam, coal, factory
       |
       v
Information           ~1970s: computer, internet

1. Agricultural society (from the Neolithic Revolution, about 10,000 BC)

• Domestication of plants and animals; settled villages; land was the main wealth.
• Tools: plough, sickle, irrigation; energy from humans and animals.
• Feudal social structure; slow change; most people were farmers.

2. Transition to industrial society (from about 1760)

• Agricultural revolution (crop rotation, enclosures, seed drill) increased food and freed labour.
• The Renaissance and Scientific Revolution gave science and a rational mindset.
• Trade and colonies gave capital, raw materials and markets.
• Steam engine, textile machines, iron and coal created factories; people moved to cities as wage workers.
• Capital and machines became the main resources.

3. Transition to information society (from about the 1960s–70s)

• Automation and mass production reduced the need for factory workers; jobs moved to services (banking, education, health, trade).
• Electronics revolution: transistor (1947), IC (1958), microprocessor (1971) and personal computers (1980s).
• Telecommunication: satellites, optical fibre, internet (WWW in 1991), mobile phones and later smartphones.
• Higher education produced knowledge workers; research and software became major industries.
• Globalisation: manufacturing moved to cheaper countries while design, finance and information work stayed in developed ones.

Each stage did not remove the earlier one: farming and industry still exist, but they are now run and improved by information technology (e.g. smart farming, automated factories). Nepal shows a mix of all three stages today.

The change from industrial to information society (from about the 1970s) brought new opportunities, but people faced several hurdles:

1. Job loss and unemployment – automation and computers replaced many factory and clerical jobs; workers in old industries (steel, coal, textiles) lost jobs.
2. Skill gap – new jobs needed computer and technical skills; older and less educated workers found it hard to retrain.
3. Digital divide – unequal access to computers, internet and skills between rich and poor, urban and rural, and developed and developing countries.
4. High cost of hardware, software and network infrastructure in the early stage.
5. Resistance to change – fear of technology, habit of old methods, and opposition by trade unions.
6. Information overload and misinformation – too much information, fake news and difficulty in judging reliable sources.
7. Privacy and security problems – cyber crime, hacking, data theft, surveillance.
8. Social and cultural change – less face-to-face contact, isolation, generation gap, and erosion of traditional values.
9. Legal and policy gaps – laws for e-commerce, intellectual property and cyber crime came late.
10. Health and environmental issues – sedentary work, eye strain, and growing e-waste.

These hurdles were reduced by education and retraining programmes, cheaper technology, ICT policies, and cyber laws (in Nepal, the Electronic Transactions Act, 2063).

World War II (1939–1945) was a global war between the Allies (Britain, France, USSR, USA, China) and the Axis (Germany, Italy, Japan). It ended with Germany's surrender in May 1945 and Japan's surrender in August 1945 after the atomic bombs on Hiroshima and Nagasaki.

Key reasons (causes) of World War II

1. Treaty of Versailles (1919) – Germany was humiliated: it lost territory and colonies, its army was limited and it had to pay huge reparations; this created anger and a desire for revenge.
2. Great Depression (1929) – world economic crisis caused mass unemployment and poverty, helping extremist parties gain power.
3. Rise of Fascism and Nazism – Mussolini in Italy (1922), Hitler in Germany (1933) and militarists in Japan wanted expansion and glorified war.
4. Failure of the League of Nations – it could not stop Japan's invasion of Manchuria (1931) or Italy's attack on Ethiopia (1935); it had no army and the USA was not a member.
5. Policy of appeasement – Britain and France gave in to Hitler (Rhineland 1936, Austria 1938, Sudetenland at Munich 1938), which encouraged more aggression.
6. Expansionism and alliances – Rome–Berlin–Tokyo Axis; Nazi–Soviet Non-Aggression Pact (August 1939).
7. Immediate cause – Germany invaded Poland on 1 September 1939; Britain and France declared war on 3 September 1939. The USA joined after Japan attacked Pearl Harbor (7 December 1941).

Political effects

• United Nations founded in 1945 to maintain peace.
• USA and USSR emerged as superpowers; Britain and France declined.
• Cold War – ideological rivalry between capitalist West (NATO, 1949) and communist East (Warsaw Pact, 1955); nuclear arms race.
• Division of Germany (East and West) and of Korea; Communist China (1949).
• Decolonisation – India and Pakistan (1947), Burma, Indonesia and most African countries gained independence.
• Creation of Israel (1948); Nuremberg and Tokyo war-crime trials; Universal Declaration of Human Rights (1948).

Economic effects

• Massive destruction of industry, cities and transport in Europe and Asia; huge debts and inflation.
• Bretton Woods system (1944) – IMF and World Bank; the US dollar became the world reserve currency.
• Marshall Plan (1948) – US aid rebuilt Western Europe; later "economic miracles" in West Germany and Japan.
• USA became the largest industrial and creditor nation.
• War technologies (jet engines, radar, computers, nuclear power, synthetic rubber) boosted post-war industry.
• Growth of GATT (1947) and free trade; rise of welfare states in Europe.

World War I (1914–1918)

Causes (MAIN): Militarism (arms race), Alliances (Triple Alliance vs Triple Entente), Imperialism (rivalry for colonies), Nationalism; immediate cause: assassination of Archduke Franz Ferdinand at Sarajevo (28 June 1914).

Impacts: about 15–20 million deaths; collapse of German, Austro-Hungarian, Ottoman and Russian empires; Russian Revolution (1917); harsh Treaty of Versailles (1919); League of Nations (1920); new technology such as tanks, aircraft and submarines; women's role in work and voting rights increased.

World War II (1939–1945)

Causes: anger at the Treaty of Versailles, Great Depression (1929), rise of Hitler, Mussolini and Japanese militarism, failure of the League of Nations, appeasement; immediate cause: German invasion of Poland (1 September 1939).

Impacts: about 70–85 million deaths and the Holocaust; atomic bombing of Hiroshima and Nagasaki; United Nations (1945), IMF and World Bank; USA and USSR became superpowers and the Cold War began; decolonisation of Asia and Africa; Marshall Plan; technologies such as radar, jet engines, computers and nuclear energy.

Impacts of World War I (1914–1918)

• Human loss: about 15–20 million deaths and millions injured.
• Political: fall of the German, Austro-Hungarian, Ottoman and Russian empires; new nations (Poland, Czechoslovakia, Yugoslavia); Russian Revolution (1917); League of Nations (1920).
• Economic: Europe's economy weakened, heavy war debts; USA became a creditor nation.
• Social: women entered factories and later got voting rights in many countries.
• Technology: tanks, aircraft, submarines, chemical weapons, radio.
• The harsh Treaty of Versailles sowed the seeds of WWII.

Impacts of World War II (1939–1945)

• Human loss: about 70–85 million deaths, Holocaust, millions of refugees.
• Political: United Nations (1945); USA and USSR as superpowers; Cold War; division of Germany and Korea; decolonisation of Asia and Africa.
• Economic: destruction of Europe and Japan; IMF, World Bank, GATT; Marshall Plan; US dollar as world currency.
• Social: human rights (UDHR 1948), women's employment, baby boom, welfare states.
• Technology: radar, jet engines, rockets, nuclear energy, computers, antibiotics.

Population explosion

Population explosion is a sudden, very rapid rise in population when death rates fall but birth rates remain high. World population rose from about 2.5 billion in 1950 to over 8 billion in 2022.

Causes:

• Medical progress (vaccines, antibiotics — partly from wartime research), control of epidemics.
• Green Revolution: more food, less famine.
• Better sanitation and safe water; lower infant mortality; longer life.
• High birth rates due to early marriage, illiteracy, poverty, desire for sons, low contraceptive use.
• Post-war baby boom in many countries.

Effects:

• Pressure on food, water, energy, housing and jobs.
• Deforestation, pollution, loss of biodiversity and climate change.
• Unemployment, poverty, slums and migration.
• Strain on health and education services.

Control measures: education (especially of girls), family planning, women's empowerment, poverty reduction, and better health services so families need fewer children.

The two world wars (1914–1918 and 1939–1945) were "total wars" in which governments put science and industry fully behind the war effort. This greatly speeded up technology and also changed social and cultural values.

Role in advancing technology

After the wars these became civilian technologies: commercial flights, nuclear power, computers, radio and TV, antibiotics, and space exploration.

Shaping of new cultural values

• Women's empowerment – women worked in factories and offices; they gained voting rights and more freedom.
• Human rights and peace – UN (1945) and Universal Declaration of Human Rights (1948); anti-war and anti-nuclear movements.
• Decline of colonial and racial ideas – independence movements and later civil rights movements.
• Consumer and mass culture – growth of middle class, cinema, radio, TV, American popular culture.
• Faith in science – governments funded research (R&D culture).
• Welfare state – governments took responsibility for health, education and social security.

Climate change is a long-term change in the average temperature and weather patterns of the Earth, now mainly caused by human activities that release greenhouse gases (CO₂, CH₄, N₂O, CFCs). The global average temperature is already about 1.1–1.2 °C above pre-industrial levels (IPCC AR6), and the effects threaten the base of human civilisation: food, water, health, settlements and peace.

Justification with examples

1. Food security – heat, drought and erratic monsoon reduce crop yields (rice, wheat, maize); pests spread; risk of hunger in South Asia and Africa.
2. Water crisis – melting glaciers (Himalaya, the "water tower of Asia") first increase floods and then reduce dry-season flow; springs in Nepal's hills are drying.
3. Sea level rise – about 20 cm since 1900; threatens coastal cities (Dhaka, Mumbai, Jakarta) and small island countries (Maldives, Tuvalu).
4. Extreme events – stronger heat waves, cyclones, floods and droughts, e.g. 2022 Pakistan floods (about one-third of the country flooded), European heat waves, 2021 Melamchi flood in Nepal.
5. Glacial lake outburst floods (GLOF) – e.g. Imja and Tsho Rolpa lakes in Nepal.
6. Health – heat stress, spread of dengue and malaria to higher altitudes (dengue now in Kathmandu and hill districts).
7. Biodiversity loss – coral bleaching, species extinction, shifting tree lines.
8. Economy and migration – damage to infrastructure, tourism and hydropower; climate refugees and conflict over resources.

GHG emissions --> warming --> glacier melt, heat,
                              erratic rain, sea rise
                                      |
                 food, water, health, homes at risk
                                      |
                 poverty, migration, conflict

Past civilisations (e.g. the Maya and the Indus Valley) are believed to have declined partly due to long droughts. Today's change is faster and global, so it threatens all humanity, especially poor and mountain countries like Nepal that contribute very little (about 0.1% of global emissions).

Way forward

• Renewable energy – hydropower, solar, wind instead of coal and oil.
• Energy efficiency – efficient appliances, buildings and industry.
• Clean transport – electric vehicles, public transport, cycling.
• Forests – afforestation, community forestry, REDD+.
• Sustainable agriculture – less methane from rice and livestock, organic farming.
• Waste management – reduce, reuse, recycle; capture landfill methane.
• International agreements – UNFCCC (1992), Kyoto Protocol (1997), Paris Agreement (2015): keep warming well below 2 °C, aiming at 1.5 °C; Nepal targets net-zero emissions by 2045.
• Adaptation – climate-resilient infrastructure, early warning systems, drought-tolerant crops, water harvesting.

Hence the statement is justified: unless emissions are cut quickly and societies adapt, climate change can undo the gains of human civilisation.

Climate change is a long-term change in the average temperature and weather patterns of the Earth, now mainly caused by human activities that release greenhouse gases (CO₂, CH₄, N₂O, CFCs). The global average temperature is already about 1.1–1.2 °C above pre-industrial levels (IPCC AR6), and the effects threaten the base of human civilisation: food, water, health, settlements and peace.

Why it is a threat to civilisation

Civilisation depends on a stable climate for farming, water supply, settlements and trade. Rapid warming disturbs all of these at once, affects billions of people, and its damage (e.g. glacier loss, extinction) is often irreversible.

Impacts

1. Food security – heat, drought and erratic monsoon reduce crop yields (rice, wheat, maize); pests spread; risk of hunger in South Asia and Africa.
2. Water crisis – melting glaciers (Himalaya, the "water tower of Asia") first increase floods and then reduce dry-season flow; springs in Nepal's hills are drying.
3. Sea level rise – about 20 cm since 1900; threatens coastal cities (Dhaka, Mumbai, Jakarta) and small island countries (Maldives, Tuvalu).
4. Extreme events – stronger heat waves, cyclones, floods and droughts, e.g. 2022 Pakistan floods (about one-third of the country flooded), European heat waves, 2021 Melamchi flood in Nepal.
5. Glacial lake outburst floods (GLOF) – e.g. Imja and Tsho Rolpa lakes in Nepal.
6. Health – heat stress, spread of dengue and malaria to higher altitudes (dengue now in Kathmandu and hill districts).
7. Biodiversity loss – coral bleaching, species extinction, shifting tree lines.
8. Economy and migration – damage to infrastructure, tourism and hydropower; climate refugees and conflict over resources.

Mitigation measures

• Renewable energy – hydropower, solar, wind instead of coal and oil.
• Energy efficiency – efficient appliances, buildings and industry.
• Clean transport – electric vehicles, public transport, cycling.
• Forests – afforestation, community forestry, REDD+.
• Sustainable agriculture – less methane from rice and livestock, organic farming.
• Waste management – reduce, reuse, recycle; capture landfill methane.
• International agreements – UNFCCC (1992), Kyoto Protocol (1997), Paris Agreement (2015): keep warming well below 2 °C, aiming at 1.5 °C; Nepal targets net-zero emissions by 2045.

Mitigation must go with adaptation (early warning, resilient roads and bridges, irrigation, Nepal's National Adaptation Plan and Local Adaptation Plans of Action, LAPA).