This deep dive covers Deforestation: The Causes within Tropical Rainforests for GCSE Geography. Revise Tropical Rainforests in The Living World for GCSE Geography with 15 exam-style questions and 22 flashcards. This topic shows up very often in GCSE exams, so students should be able to explain it clearly, not just recognise the term. It is section 5 of 14 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 5 of 14
Practice
15 questions
Recall
22 flashcards
🪓 Deforestation: The Causes
Deforestation in the Amazon is not the result of a single activity — it is driven by multiple overlapping forces, each linked to the others. The chain typically starts with a government road being built into previously inaccessible forest, which brings settlers, loggers, and ranchers. Understanding this chain of causation is essential for the exam.
1. Cattle Ranching — the single largest cause (~70% of cleared land)
Brazil is one of the world's largest beef exporters, producing around 15% of global beef exports. The economics are simple: forest land is cheap or free (if cleared illegally), cattle can be grazed immediately, and global demand for beef — particularly from China, Europe, and the USA — has risen steadily. Ranches in the Amazon are enormous, often covering tens of thousands of hectares. Ranchers clear forest by burning, releasing carbon and destroying biodiversity in the process. The land supports cattle for perhaps 5–10 years before soil degradation forces the rancher to move on and clear new forest. In some areas, ranching acts as a "placeholder": ranchers clear and claim land, then sell it to soya farmers once road access improves.
Brazil is one of the world's largest beef exporters, producing around 15% of global beef exports. The economics are simple: forest land is cheap or free (if cleared illegally), cattle can be grazed immediately, and global demand for beef — particularly from China, Europe, and the USA — has risen steadily. Ranches in the Amazon are enormous, often covering tens of thousands of hectares. Ranchers clear forest by burning, releasing carbon and destroying biodiversity in the process. The land supports cattle for perhaps 5–10 years before soil degradation forces the rancher to move on and clear new forest. In some areas, ranching acts as a "placeholder": ranchers clear and claim land, then sell it to soya farmers once road access improves.
2. Soya Farming — Brazil's fastest-growing agricultural industry
Brazil is now the world's largest exporter of soya, earning approximately $33 billion per year. Around 25 million hectares of Brazilian land is planted with soya — much of it in the Cerrado (Brazil's savanna) and in the southern Amazon states of Mato Grosso and Pará. The soya is primarily grown as animal feed, exported to China and Europe to feed chickens, pigs, and cattle. The European Union is a major buyer. Although soya farms rarely clear primary Amazon forest directly (the iconic "deforestation for soya" imagery has become less common since the Soya Moratorium of 2006), soya expansion pushes cattle ranchers further north into the Amazon. Roads built to transport soya — such as the BR-163 (the "soya highway") through Mato Grosso — open up previously inaccessible forest to illegal settlement.
Brazil is now the world's largest exporter of soya, earning approximately $33 billion per year. Around 25 million hectares of Brazilian land is planted with soya — much of it in the Cerrado (Brazil's savanna) and in the southern Amazon states of Mato Grosso and Pará. The soya is primarily grown as animal feed, exported to China and Europe to feed chickens, pigs, and cattle. The European Union is a major buyer. Although soya farms rarely clear primary Amazon forest directly (the iconic "deforestation for soya" imagery has become less common since the Soya Moratorium of 2006), soya expansion pushes cattle ranchers further north into the Amazon. Roads built to transport soya — such as the BR-163 (the "soya highway") through Mato Grosso — open up previously inaccessible forest to illegal settlement.
3. Logging — legal and illegal
Approximately 80% of timber harvested from the Amazon is illegal, according to estimates by environmental organisations. Hardwood species such as mahogany and teak are extremely valuable — a single large mahogany tree can be worth several thousand pounds. Selective felling of high-value trees causes direct habitat damage and opens the forest up to light, allowing flammable grasses to grow and increasing fire risk. Legal logging for construction timber also occurs, though it represents a smaller proportion of total deforestation. Logging roads act as arteries: once a road is built to extract timber, settlers, ranchers, and miners follow.
Approximately 80% of timber harvested from the Amazon is illegal, according to estimates by environmental organisations. Hardwood species such as mahogany and teak are extremely valuable — a single large mahogany tree can be worth several thousand pounds. Selective felling of high-value trees causes direct habitat damage and opens the forest up to light, allowing flammable grasses to grow and increasing fire risk. Legal logging for construction timber also occurs, though it represents a smaller proportion of total deforestation. Logging roads act as arteries: once a road is built to extract timber, settlers, ranchers, and miners follow.
4. Road Building — opening the interior
The Trans-Amazonian Highway, begun in the 1970s, was a government project to open Brazil's interior to settlement, with the slogan "land without men for men without land." It ran 4,000 km through the heart of the Amazon. Settlers were given plots of land along the road. In practice, the road brought not only settlers but also illegal loggers, ranchers, and miners. Modern satellite analysis shows that the vast majority of deforestation occurs within 50 km of a road. The BR-163 — the "soya highway" from Cuiabá (Mato Grosso) to Santarém (Pará) — when paved in the 2000s, caused a significant spike in deforestation along its length.
The Trans-Amazonian Highway, begun in the 1970s, was a government project to open Brazil's interior to settlement, with the slogan "land without men for men without land." It ran 4,000 km through the heart of the Amazon. Settlers were given plots of land along the road. In practice, the road brought not only settlers but also illegal loggers, ranchers, and miners. Modern satellite analysis shows that the vast majority of deforestation occurs within 50 km of a road. The BR-163 — the "soya highway" from Cuiabá (Mato Grosso) to Santarém (Pará) — when paved in the 2000s, caused a significant spike in deforestation along its length.
5. Mining — gold, iron ore, and bauxite
The Amazon sits above vast mineral deposits. The Serra Pelada goldmine, discovered in 1979, attracted over 100,000 miners ("garimpeiros") at its peak — one of the largest gold rushes in history. Mercury used in gold extraction has contaminated river systems across the Amazon, poisoning indigenous communities and fish. Iron ore extraction is centred on the Carajás mine in Pará — the world's largest iron ore mine — operated by the Brazilian mining giant Vale. While large mines employ many workers and generate export revenue, they cause significant deforestation, water pollution, and displacement of communities. Illegal artisanal gold mining (garimpo) has surged in recent years, particularly on Yanomami indigenous lands.
The Amazon sits above vast mineral deposits. The Serra Pelada goldmine, discovered in 1979, attracted over 100,000 miners ("garimpeiros") at its peak — one of the largest gold rushes in history. Mercury used in gold extraction has contaminated river systems across the Amazon, poisoning indigenous communities and fish. Iron ore extraction is centred on the Carajás mine in Pará — the world's largest iron ore mine — operated by the Brazilian mining giant Vale. While large mines employ many workers and generate export revenue, they cause significant deforestation, water pollution, and displacement of communities. Illegal artisanal gold mining (garimpo) has surged in recent years, particularly on Yanomami indigenous lands.
6. Hydroelectric Power (HEP) Dams — energy for a growing economy
Brazil generates around 65% of its electricity from hydroelectric power. The Belo Monte Dam on the Xingu River, completed in 2019, is the third largest hydroelectric dam in the world. Its reservoir flooded approximately 500 km² of forest and displaced an estimated 20,000 indigenous people from their homes. Proponents argue it provides clean electricity for 40 million Brazilians. Critics argue the environmental and human costs were too high, and that the dam generates far less power than designed (because the Xingu's seasonal flow is much reduced, partly because of upstream deforestation). It became one of the most contested development projects in Amazon history.
Brazil generates around 65% of its electricity from hydroelectric power. The Belo Monte Dam on the Xingu River, completed in 2019, is the third largest hydroelectric dam in the world. Its reservoir flooded approximately 500 km² of forest and displaced an estimated 20,000 indigenous people from their homes. Proponents argue it provides clean electricity for 40 million Brazilians. Critics argue the environmental and human costs were too high, and that the dam generates far less power than designed (because the Xingu's seasonal flow is much reduced, partly because of upstream deforestation). It became one of the most contested development projects in Amazon history.
7. Population Pressure and Subsistence Farming — the human dimension
Brazil's colonisation programmes of the 1970s and 1980s encouraged landless poor from the drought-prone northeast to relocate to the Amazon. Today, millions of smallholders practise slash-and-burn agriculture (shifting cultivation): clearing a patch of forest, farming it until the soil fails within 3–5 years, then moving on to clear new forest. While no single small farmer clears much land, cumulatively their impact is significant. The underlying driver is inequality: Brazil has one of the highest rates of land inequality in the world, with vast estates owned by a small elite and millions of landless rural poor. As long as poverty persists and land reform is absent, pressure on the forest will continue.
Brazil's colonisation programmes of the 1970s and 1980s encouraged landless poor from the drought-prone northeast to relocate to the Amazon. Today, millions of smallholders practise slash-and-burn agriculture (shifting cultivation): clearing a patch of forest, farming it until the soil fails within 3–5 years, then moving on to clear new forest. While no single small farmer clears much land, cumulatively their impact is significant. The underlying driver is inequality: Brazil has one of the highest rates of land inequality in the world, with vast estates owned by a small elite and millions of landless rural poor. As long as poverty persists and land reform is absent, pressure on the forest will continue.