World Agriculture, Resources and Trade

UPSC rarely asks this chapter as a direct definition question. It asks country-resource pairs (how many of these three pairs are correctly matched), matching lists of crops to their growing regions, or a statement-based question built around a named belt: the Pampas, the Prairies, the Katanga copper-cobalt belt. That means the useful unit of revision here is not "what is plantation agriculture" but "which countries actually grow, mine or produce this, and how much of the world total". World Political Geography and Time Zones already covers the five named world trade choke points, the Strait of Hormuz, the Strait of Malacca, the Suez Canal, Bab-el-Mandeb and the Panama Canal, and what each one connects, so this note does not repeat them. What follows instead is the rest of the chapter: how the world's farming systems sort into named types and named regions, where the big three raw materials of industrial life, iron ore, coal and petroleum, actually come from, and the handful of trade groupings UPSC has reason to test.

Subsistence Farming: Shifting Cultivation to Wet Paddy

The oldest form of cultivation still practised today is shifting cultivation, a subsistence system found across the tropics: wide belts of Africa, South and Central America, and South-East Asia. Farmers clear a small forest patch, usually by burning it (the ash adds fertility to the soil, which is why the system is also called slash-and-burn agriculture), cultivate it for three to five years with simple tools until the soil's fertility drops, then move on and clear a fresh patch, sometimes returning to the original one years later once it has recovered. The system carries a different local name in each region it occurs: jhumming in India's north-eastern states, milpa in Central America and Mexico, and ladang in Indonesia and Malaysia. UPSC has tested this exact matching before and can do so again, since the three names map to three distinct regions, not interchangeably.

Intensive subsistence agriculture, by contrast, is the dominant system across densely populated monsoon Asia, and splits into two types. Where wet paddy dominates, land holdings are tiny because of high population density, family labour substitutes for machinery, and yield per unit area is high even though output per worker stays low. Where the terrain, climate or soil rules out rice, the same basic system instead grows wheat, soyabean, barley or sorghum, as across northern China, Manchuria, North Korea and northern Japan; within India this non-paddy variant grows wheat across the western Indo-Gangetic plain and millets in the drier parts of western and southern India, generally with more reliance on irrigation than its paddy counterpart.

Commercial Grain Farming, Mixed Farming and Dairying

Extensive commercial grain farming occupies the interior semi-arid mid-latitude belts of several continents at once, and wheat is its defining crop, alongside smaller acreages of corn, barley, oats and rye. Because farm sizes run very large and the whole operation from ploughing to harvest is mechanised, this system produces a low yield per acre but a very high yield per person, the reverse of intensive subsistence farming. GC Leong's own named list of where this system is best developed is worth holding onto exactly, since UPSC has asked "which of these regions does NOT practise it": the Eurasian steppes, the Canadian and American Prairies, the Pampas of Argentina, the Velds of South Africa, the Australian Downs, and the Canterbury Plains of New Zealand. All of these sit in the temperate interior, well away from the tropics, which is exactly why a region like the Amazon Basin is the standard wrong-option trap in this list.

Mixed farming sits in the world's most developed temperate belts, north-western Europe, eastern North America, parts of Eurasia, and the temperate latitudes of the southern continents, and combines crop cultivation (wheat, barley, oats, rye, maize, fodder and root crops) with livestock rearing (cattle, sheep, pigs, poultry) on the same moderate-sized farm, with crop rotation and intercropping used to keep soil fertility up rather than relying on fallow alone. Dairy farming is the most capital-intensive form of livestock rearing, and clusters into three main world belts: north-western Europe (the largest), Canada, and a third belt spanning south-eastern Australia, New Zealand and Tasmania. Because fresh milk is highly perishable, dairy belts sit close to the urban and industrial markets they supply, and the system's spread beyond its original belts owes a great deal to the later development of refrigeration and fast transport.

Plantation Agriculture and Mediterranean Agriculture

Plantation agriculture is a colonial-era system, introduced by European powers into their tropical colonies, and its defining features are large estates, heavy capital investment, single-crop specialisation (monoculture), cheap labour, and transport infrastructure purpose-built to move the crop from estate to port. The crop-to-coloniser-to-region pattern is itself a favourite matching-question source: the British set up tea gardens in India and Sri Lanka and rubber plantations in Malaysia; the French established cocoa and coffee plantations in West Africa; the Dutch once held a monopoly on sugarcane plantations in Indonesia; and the British also planted sugarcane and bananas across the West Indies. Brazil's coffee estates, historically called fazendas, are a further named example, some still under European management. The core plantation crop list is worth holding as a set: tea, coffee, cocoa, rubber, cotton, oil palm, sugarcane, bananas and pineapples. Most plantations have since passed from colonial into government or national ownership.

Mediterranean agriculture is a distinct, highly specialised commercial system tied to a specific climate rather than to colonial history, and it recurs on five separated landmasses that all share the same wet-winter, dry-summer regime: the lands around the Mediterranean Sea itself, from Tunisia across to the Atlantic coast of Morocco; southern California; central Chile; the south-western Cape region of South Africa; and the south and south-western coastal belt of Australia. The signature crops are citrus fruit, olives and figs, plus viticulture, grape cultivation for the world's best wines as well as for raisins and currants from the lower-grade fruit. The system's underlying commercial logic is timing: because Mediterranean winters are mild enough to grow fruit and vegetables when Europe and North America cannot, these regions can sell into a market with no domestic competition for that season. A related but smaller-scale system, market gardening and horticulture, grows high-value vegetables, fruit and flowers purely for nearby urban markets, most developed in north-western Europe and the north-eastern United States; the Netherlands' tulip industry is the standard named example. Where farms specialise in vegetables alone and sit close enough to a city for an overnight truck delivery, the practice is called truck farming.

Extensive Livestock Rearing and Ranching

Nomadic herding (pastoral nomadism) is the subsistence-level counterpart to commercial ranching: herders move with their livestock in search of pasture and water rather than settling permanently, and the animal kept depends on the region, cattle across tropical Africa, sheep and goats and camels across the Sahara and the deserts of Asia, yak and llama in the high mountains of Tibet and the Andes, and reindeer across the Arctic and sub-Arctic. Three world belts carry most of this activity: a broad core running from the Atlantic shores of North Africa across the Arabian peninsula into Mongolia and central China, the Eurasian tundra belt, and smaller pockets in south-west Africa and Madagascar. Where the movement runs vertically, between mountain pastures in summer and valley or plain pastures in winter, it is called transhumance, seen in the Himalayas among communities such as the Gujjars, Bakarwals, Gaddis and Bhotiyas.

Commercial livestock rearing (ranching) is the organised, capital- intensive opposite of nomadic herding: fenced, rotated pastures, a single specialised animal per ranch (sheep, cattle, goats or horses), and scientific breeding and disease control aimed at exporting meat, wool, hides and skins to distant markets. This system is essentially a Western settler-economy activity, concentrated in the United States, Argentina, Uruguay, Australia and New Zealand, a list that is itself worth distinguishing from the extensive-grain-farming list above; several countries (the United States, Argentina, Australia, New Zealand) appear in both because the same temperate, sparsely populated interior supports both wheat farms and cattle or sheep ranches, just on different tracts of land.

World Mineral Resources: Iron Ore and Coal

Iron ore and coal are the two raw materials behind the modern steel industry, and their world production is sharply concentrated in a handful of countries. By the US Geological Survey's 2025 estimate, world mine production of usable iron ore in 2024 stood at about 2.5 billion tonnes, and just two countries, Australia (roughly 930 million tonnes, well over a third of the world total) and Brazil (about 440 million tonnes, close to a fifth), between them account for over half of it. China and India each produced close to 270 million tonnes in 2024, putting the four together at over three-quarters of world output; Russia, Ukraine, South Africa and Canada make up most of the rest. Australia and Brazil dominate not just production but seaborne exports, since China, the world's largest steel producer, imports the bulk of the ore it processes rather than mining enough domestically.

World coal production shows an even sharper concentration at the very top: China alone mines roughly half of all the coal produced on earth in a year, and produces more coal than the rest of the world combined by some counts. India is a distant second, and Indonesia third, with the United States, Australia and Russia trailing further behind at roughly similar levels. This lopsided distribution matters for the exam because it inverts the more even spread typical of, say, iron ore: a "which country is NOT among the top coal producers" question has a much shorter honest list of correct answers than most students expect.

Petroleum and the Critical Minerals of the Energy Transition

Petroleum geography carries a genuine trap: the region that holds most of the world's proven reserves is not the same as the country that currently produces the most oil. The Middle East, concentrated around the Persian Gulf, holds close to half of the world's proven crude oil reserves, with Saudi Arabia, Iraq, Kuwait, the United Arab Emirates and Iran together accounting for the bulk of that share; this is also the geological reason the Strait of Hormuz carries the outsized strategic weight the choke-points note already covers. But on current output, the United States has been the world's largest crude oil producer for several years running, at close to 13 million barrels a day by 2024, well ahead of Saudi Arabia and Russia, both producing in the roughly 9 to 11 million barrels a day range. The gap exists because reserves measure what is geologically present and recoverable, while production reflects extraction technology, investment and, for OPEC members, deliberate output quotas; the United States sits nowhere near the top of the reserves table despite leading on production, driven instead by shale extraction.

A newer layer of mineral geography has entered the UPSC syllabus alongside the electric-vehicle and battery economy, and it shows the same extreme concentration seen in coal. The Democratic Republic of the Congo supplies roughly three-quarters of the world's mined cobalt, a battery input, from its Katanga copper-cobalt belt. Indonesia supplies over three-fifths of the world's mined nickel, another battery metal, a dominance built rapidly through the 2020s. Lithium production is less concentrated in a single country but is still tightly held: Australia, Chile and China together supply around three-quarters of the world total, with Australia alone supplying more than a third. These country-resource pairs, cobalt and the DRC, nickel and Indonesia, lithium and Chile or Australia, are precisely the shape of question UPSC has already asked and is likely to keep asking, since a single dominant supplier for a strategically important mineral is an easy, defensible, single-fact question to write.

World Trade Patterns and Economic Groupings

The classical pattern of world trade, developing countries exporting primary produce (crops, ores, fuel) and developed countries exporting manufactured goods, still shapes a great deal of actual trade flow even though it has blurred as some developing economies industrialised. Two groupings are worth knowing by their founding facts rather than only their current membership, since founding details are stable and membership lists shift.

The Organization of the Petroleum Exporting Countries (OPEC) was founded in Baghdad in September 1960 by five countries, Iran, Iraq, Kuwait, Saudi Arabia and Venezuela, with the stated purpose of coordinating and unifying petroleum policy among member states to secure stable prices for producers and a steady supply for consumers. Because several Gulf members hold both large reserves and large production, OPEC (and the wider OPEC+ grouping that later added non-member producers such as Russia) can influence world oil prices by coordinating output changes, even though, as covered above, the largest single producer today is a non-member, the United States.

The Association of Southeast Asian Nations (ASEAN) was founded on 8 August 1967 through the Bangkok Declaration, signed by five countries, Indonesia, Malaysia, the Philippines, Singapore and Thailand, to promote regional economic, social and cultural cooperation and regional stability. ASEAN has since expanded well beyond its founders, adding Brunei (1984), Vietnam (1995), Laos and Myanmar (1997), Cambodia (1999) and, most recently, Timor-Leste, taking it to eleven member states. Beyond these two named blocs, the broader pattern worth remembering is that resource trade increasingly flows from a few concentrated producing countries (Australia and Brazil for iron ore, the Gulf for crude oil, the DRC and Indonesia for battery minerals) toward a small number of large manufacturing and consuming economies, chiefly China, which is why a handful of named sea and pipeline routes, the ones the choke-points note already covers, carry such disproportionate strategic weight.

Quick revision points

• Shifting cultivation by local name: jhumming (north-east India), milpa (Central America/Mexico), ladang (Indonesia/Malaysia).
• Extensive commercial grain farming belts: Eurasian steppes, Canadian/American Prairies, Pampas (Argentina), Velds (South Africa), Australian Downs, Canterbury Plains (New Zealand); low yield per acre, high yield per person.
• Dairy farming's three belts: north-western Europe, Canada, south-eastern Australia/New Zealand/Tasmania.
• Plantation agriculture: colonial-origin, single-crop, e.g. British tea in India/Sri Lanka, British rubber in Malaysia, French cocoa/coffee in West Africa, Brazilian coffee fazendas.
• Mediterranean agriculture's five world regions: the Mediterranean basin, southern California, central Chile, South Africa's south-west Cape, and south/south-west Australia; citrus, viticulture, olives, figs.
• Commercial ranching countries: United States, Argentina, Uruguay, Australia, New Zealand.
• Iron ore 2024: Australia (~37%) and Brazil (~18%) lead; China and India each near 11%; top four exceed three-quarters of world output.
• Coal: China alone mines roughly half the world total; India second, Indonesia third.
• Petroleum: the Middle East holds close to half of proven reserves, but the United States is the largest current producer, ahead of Saudi Arabia and Russia. Reserves and production are not the same ranking.
• Critical minerals: DRC produces about three-quarters of world cobalt; Indonesia over three-fifths of world nickel; Australia, Chile and China together about three-quarters of world lithium.
• OPEC: founded 1960, Baghdad, by Iran, Iraq, Kuwait, Saudi Arabia and Venezuela. ASEAN: founded 1967, Bangkok Declaration, by Indonesia, Malaysia, the Philippines, Singapore and Thailand, now eleven members.

Most questions on this chapter reduce to one move: pin the crop, mineral or system to its named region and hold the numbers that show how concentrated (or spread out) that production really is, then practise the statement and matching-pair questions built around exactly that specificity.