How can we produce enough food without damaging the environment for the future?
Sustainable food production and land use; the environmental impacts of intensive farming; methods that make food production more sustainable; and the issue of feeding a growing population.
An SQA National 5 Environmental Science answer on sustainable food production, covering the environmental impacts of intensive farming, methods that make food production more sustainable such as crop rotation and organic farming, land use, and the challenge of feeding a growing population.
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What this dot point is asking
The SQA wants you to describe the environmental impacts of intensive food production, explain methods that make food production more sustainable, consider how land is used, and explain why feeding a growing population without damaging the environment is a sustainability challenge.
The environmental impacts of intensive farming
Intensive farming aims to get the highest possible yield from the land, often using chemicals, machinery and single large crops. It feeds many people, but it carries environmental costs:
- Soil degradation. Continuous intensive cropping removes nutrients and organic matter and can leave soil bare and exposed to erosion.
- Fertiliser run-off. Heavy use of chemical fertiliser washes nitrates and phosphates into rivers, causing eutrophication (algal blooms whose decay removes oxygen and kills aquatic life).
- Loss of biodiversity. Growing a single crop over a large area (monoculture) provides little variety of habitat, and pesticides kill non-target species such as pollinators, so wildlife declines.
- High water and energy use. Irrigation and machinery use large amounts of water and energy, and clearing land (deforestation) for farming destroys habitats.
Making food production more sustainable
Methods that make farming more sustainable include:
- Crop rotation. Changing the crop grown in a field each season maintains soil fertility and breaks the life cycles of pests and diseases, reducing the need for chemicals.
- Organic fertiliser. Using manure or compost instead of (or as well as) chemical fertiliser returns organic matter to the soil and reduces run-off.
- Nitrogen-fixing crops. Growing legumes (peas, beans, clover) lets nitrogen-fixing bacteria enrich the soil naturally, cutting the need for manufactured nitrogen fertiliser.
- Biological pest control. Using natural predators instead of chemical pesticides avoids chemical pollution and harm to non-target species.
- Reduced tillage and keeping plant cover to protect soil from erosion.
- Protecting field margins and hedgerows to give wildlife habitat and support pollinators.
Land use and feeding a growing population
The human population is growing, so more food is needed. Meeting that demand pushes towards clearing more land and farming more intensively, which damages soil, water and habitats. This is the central tension: produce enough food now, but do not exhaust the resources future food production depends on. Using land wisely (and reducing food waste) is part of a sustainable answer.
Examples in context
Example 1. Legumes restoring soil nitrogen. A farmer following a wheat crop with a clover crop lets nitrogen-fixing bacteria in the clover roots add nitrates to the soil. The next cereal crop then needs less manufactured fertiliser, showing how crop rotation with legumes links the nitrogen cycle to sustainable farming.
Example 2. Deforestation for farmland. Clearing tropical forest to create new fields provides more land for food in the short term, but it destroys habitat, reduces biodiversity, releases stored carbon and exposes thin soils to erosion. This illustrates why expanding farmland to feed more people is often not sustainable.
Try this
Q1. Name one farming method that maintains soil fertility and reduces the need for chemical fertiliser. [1 mark]
- Cue. Crop rotation, including nitrogen-fixing legumes (or adding organic fertiliser such as manure).
Q2. Explain why monoculture can reduce biodiversity. [2 marks]
- Cue. A single crop over a large area provides little variety of habitat, and the pesticides used kill non-target species, so wildlife declines.
Exam-style practice questions
Practice questions written in the style of SQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
SQA N5 style4 marksDescribe two environmental problems caused by intensive farming and, for each, suggest a more sustainable practice that reduces it.Show worked answer →
A 4-mark answer needs two problems each paired with a solution, so plan two problem marks and two solution marks.
Problem 1. Heavy use of chemical fertiliser causes run-off into rivers, leading to eutrophication. Sustainable practice: use organic fertiliser (manure or compost) or grow nitrogen-fixing legumes to enrich the soil naturally, reducing chemical run-off.
Problem 2. Growing the same crop repeatedly (monoculture) drains nutrients and lowers biodiversity, and pesticide use harms non-target species. Sustainable practice: rotate crops to maintain soil fertility and break pest cycles, and use biological control instead of chemical pesticides.
Markers reward each environmental problem with a matched, sensible sustainable practice. A problem without a solution, or a solution that does not address the stated problem, loses the mark.
SQA N5 style3 marksExplain why producing enough food for a growing population is a sustainability challenge.Show worked answer →
This asks you to link population growth to the strain on resources, so each point should connect demand to an environmental cost.
As the population grows, more food is needed, which increases the pressure to produce more from the land.
Meeting this demand can mean clearing more land (deforestation), which destroys habitats and reduces biodiversity, and farming more intensively, which can degrade the soil, pollute water with fertiliser and pesticides, and use a lot of water and energy.
The challenge is to produce enough food without exhausting or damaging the soil, water and habitats that future food production depends on. Sustainable methods aim to meet present needs while protecting the resource base for the future.
Markers reward linking rising demand to land clearance and intensive farming, and to the need to protect resources for the future.
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