Why is removing every tree at once the cheapest way to log a forest but also the most damaging?
Topic 5.2 Clearcutting: describe clearcutting and explain its environmental consequences for soil, water and ecosystems.
A focused answer to APES Topic 5.2, covering clearcutting as a logging method, its economic appeal, and its consequences for soil erosion, water temperature and quality, flooding, habitat loss and biodiversity, with a worked erosion comparison.
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What this topic is asking
The College Board (Topic 5.2) wants you to describe clearcutting and explain its environmental consequences for soil, water and ecosystems, weighed against its economic appeal.
What clearcutting is
Environmental consequences
The bare, eroded soil also recovers slowly, and on steep slopes clearcutting can trigger landslides. Removing the whole canopy at once also raises ground-level temperatures and dries the soil, which can hinder the regrowth of seedlings and shift the species that recolonise the site, sometimes favoring weeds or a single fast-growing species rather than the original diverse forest.
The trade-off
Clearcutting is chosen because it is cheap and efficient, but the costs fall on the soil, water and ecosystem rather than on the logging company (an externality, and a tragedy-of-the-commons link). Selective cutting (removing only some trees) and sustainable forestry (Topic 5.17) reduce the damage by keeping much of the canopy and root network intact, at higher cost.
Why this matters
Clearcutting is a concrete case of the unit's central tension between economic land use and environmental cost. It links forestry to soil erosion (Topic 4.2), water quality and watersheds (Topic 4.6), the carbon cycle (Topic 1.4), and biodiversity loss (Topic 2.1), and sets up the sustainable alternatives discussed later in the unit.
Try this
Q1. Identify the main economic advantage of clearcutting. [1 point]
- Cue. It is the cheapest, fastest and most efficient way to harvest timber.
Q2. Explain why clearcutting raises the temperature of nearby streams. [2 points]
- Cue. Removing the trees eliminates the shade that kept the water cool, so more sunlight reaches the stream and warms it, which also lowers the dissolved oxygen available to aquatic organisms.
Exam-style practice questions
Practice questions written in the style of College Board exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
AP 2022 (style)4 marksSection II (FRQ). (a) Describe the practice of clearcutting. (b) Explain why clearcutting increases soil erosion. (c) Describe one effect of clearcutting on a nearby stream. (d) Identify one advantage of clearcutting to a logging company.Show worked answer →
A 4-point FRQ on clearcutting.
(a) Describe (1 point): clearcutting is the removal of all or nearly all trees from an area of forest in a single operation, leaving bare ground.
(b) Explain (1 point): without tree roots to hold the soil and a canopy to intercept rain, exposed soil is washed away by rainfall and wind, increasing erosion.
(c) Describe (1 point): runoff carries sediment into streams (raising turbidity and harming aquatic life), and loss of shade raises water temperature, lowering dissolved oxygen.
(d) Identify (1 point): it is fast, simple and the most economically efficient harvesting method (lowest cost, highest short-term yield).
Markers reward the all-trees-removed definition, loss of roots and canopy for erosion, a valid stream effect (sedimentation or warming), and the cost or efficiency advantage.
AP 2018 (style)1 marksSection I (multiple choice). Which is a direct environmental consequence of clearcutting a forested hillside? (A) Decreased soil erosion (B) Increased soil erosion and runoff (C) Higher soil organic matter (D) Cooler stream temperatures. Justify your choice.Show worked answer →
A 1-point MCQ on clearcutting. The answer is (B).
Removing all the trees strips away the roots that hold soil and the canopy that intercepts rain, so erosion and runoff increase. (A) is the opposite of what happens; (C) is wrong because losing trees and litter reduces organic input; (D) is wrong because losing shade raises stream temperatures. The trap is assuming clearing land has no effect on soil and water; it strongly increases erosion.
Related dot points
- Topic 5.17 Sustainable Forestry: describe sustainable forestry practices that reduce deforestation while still supplying timber.
A focused answer to APES Topic 5.17, covering sustainable forestry practices (selective cutting, reforestation, controlling pests and pathogens, sustainable yield, certification, reducing demand), how they reduce deforestation, and their benefits, with a worked sustainable-harvest calculation.
- Topic 5.1 The Tragedy of the Commons: explain how shared, unregulated resources tend to be overexploited, and describe solutions such as regulation and privatisation.
A focused answer to APES Topic 5.1, covering the tragedy of the commons, why individual self-interest depletes shared resources, examples (fisheries, grazing land, the atmosphere), and solutions such as regulation, privatisation and cooperation, with a worked grazing example.
- Topic 5.9 Impacts of Mining: compare surface and subsurface mining and explain their environmental consequences, including acid mine drainage and tailings.
A focused answer to APES Topic 5.9, covering surface mining (strip, open-pit, mountaintop removal) and subsurface mining, their environmental consequences, acid mine drainage, tailings, habitat destruction, and reclamation, with a worked overburden calculation.
- Topic 5.10 Urbanization: explain the environmental effects of urbanization, including impervious surfaces, runoff, the urban heat island, sprawl and saltwater intrusion.
A focused answer to APES Topic 5.10, covering urbanization, impervious surfaces and increased runoff, the urban heat island effect, urban sprawl, depletion and saltwater intrusion, and the benefits of smart growth, with a worked impervious-surface calculation.
- Topic 4.2 Soil Formation and Erosion: explain how soil forms from weathered rock and organic matter, describe the soil horizons, and explain the causes and effects of soil erosion.
A focused answer to APES Topic 4.2, covering weathering, the five soil-forming factors, the soil horizons (O, A, B, C, R), the causes and consequences of soil erosion, and conservation, with a worked soil-loss calculation.
Sources & how we know this
- AP Environmental Science Course and Exam Description — College Board (2020)