Environmental Risks of Economic Development (Years 10–11) — Geography

Economic development can damage the environment through soil erosion, desertification, pollution and deforestation, but sustainable management and stewardship can reduce the harm.

Growth has a shadow. The same farming, mining and manufacturing that lift people out of poverty can strip the soil, choke the air and clear the forests. The challenge Cambridge asks you to grapple with is how to develop without wrecking the environment future generations will inherit.

Why this matters — Environmental damage can undo the very development that caused it: eroded land stops feeding people, polluted water spreads disease. Understanding causes and management — and the idea of stewardship — is central to Theme 3 and to global debates on sustainability.

Soil erosion and desertification

Soil erosion is the wearing away of fertile topsoil by wind and water, often after vegetation is removed. Desertification is the process by which fertile land turns into desert, mainly at the edges of existing deserts such as the Sahel.

Overgrazing, drought and clearing trees strip and erode the soil, leading to desertification.

Causes: overgrazing, over-cultivation, deforestation, and drought made worse by climate change.
Effects: crops fail, food and water grow scarce, and people may be forced to migrate.

Pollution of water and air

Water pollution comes from factory waste, sewage, oil spills and farm chemicals washing into rivers, harming wildlife and human health. Air pollution from burning fossil fuels causes smog, acid rain and breathing problems, and contributes to global warming.

Problem	Main cause	Effect
Water pollution	Sewage, factory & farm waste	Disease, dead rivers
Air pollution	Burning fossil fuels	Smog, acid rain
Soil erosion	Removing vegetation	Lost farmland

Deforestation — case study: the Amazon Rainforest, Brazil

The Amazon is being cleared for cattle ranching, soya farming, logging, mining and roads. Around 20% of the original forest has already been lost.

Deforestation turns dense, wildlife-rich forest into bare land that quickly erodes.

Effects: loss of biodiversity and habitats; the exposed soil is quickly eroded; less rainfall recycled locally; and vast amounts of carbon dioxide released, adding to global warming.
Management: creating protected reserves, replanting (afforestation), selective logging, agroforestry, and giving local communities a stake in keeping forests standing.

Sustainable management and stewardship

Sustainable development meets present needs without harming the ability of future generations to meet theirs. Stewardship is the idea that people have a duty to care for and protect the environment for those who come after — a principle shared by many faiths and cultures. Practical measures include afforestation, terracing to stop erosion, cleaner factories, and international agreements.

Worked example (Explain, 4 marks): Explain how deforestation leads to soil erosion.
Trees are cut down, so their roots no longer bind the soil (1) and the canopy no longer shelters it from heavy rain (1). Rainfall hits the bare soil directly and washes it away (1), leaving infertile, eroded land (1).

Common exam mistake: Confusing causes with effects. Overgrazing is a cause of desertification; crop failure and migration are effects. Read the command word carefully.

Memory hook: The three big threats spell D-P-D — Desertification, Pollution, Deforestation. The cure is stewardship: "leave it better than you found it."