Edexcel 1CP2 · GCSE Computer Science · ~12 min read · 🔒 Pro
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ℹ️ Spec note: This lesson covers Environmental Impact of Computing, which falls under Edexcel 1CP2 spec section 5.1 (not 5.3). The "5.3b" label reflects its position in the CSZone lesson sequence.
The Environmental Impact of Computing
The digital revolution has brought enormous benefits, but computing also has significant environmental costs — from energy consumption to toxic waste.
Energy Consumption
Computing infrastructure consumes vast amounts of energy:
Data centres: massive facilities housing thousands of servers. A single large data centre can use as much electricity as a small town.
Personal devices: billions of smartphones, laptops, and computers all require charging
Network infrastructure: routers, switches, and transmission equipment run 24/7
Cooling systems: data centres generate enormous heat — cooling alone can account for half of energy use
If the internet were a country, it would be the sixth largest consumer of electricity in the world.
Carbon Footprint
The ICT sector accounts for approximately 2-4% of global CO₂ emissions — similar to the aviation industry. Sources include:
Electricity generation (often from fossil fuels) to power devices and data centres
Manufacturing devices — mining rare earth metals and other materials
Transporting devices globally from factories to consumers
E-waste (Electronic Waste)
E-waste is the fastest-growing waste stream in the world. When electronic devices are discarded:
Toxic materials (lead, mercury, cadmium, arsenic) can leach into soil and water
Rare metals (gold, silver, coltan) are wasted rather than recovered
Only approximately 20% of global e-waste is formally recycled
E-waste is sometimes illegally shipped to developing countries where it's processed unsafely
Raw Material Extraction
Making devices requires mining rare materials:
Coltan (for capacitors) — mining linked to conflict and rainforest destruction
Lithium (for batteries) — mining causes water depletion
Gold, copper, tin — circuit board materials requiring extensive mining
Sustainable Computing Practices
Practice
How it helps
Renewable energy for data centres
Reduces carbon footprint — companies like Google use 100% renewable energy
Virtualisation
Running multiple virtual machines on one physical server reduces hardware needed
Cloud computing
Shared infrastructure is more efficient than individual servers
E-recycling schemes
Responsibly recovering toxic materials and reusing metals
Extending device lifespan
Repair rather than replace — reduces manufacturing demand and e-waste
Energy-efficient hardware
Energy Star rated devices use less power in use and standby
Sleep mode / power management
Reduces energy use when devices are idle
Exam tip: Know specific examples for each environmental impact: energy = data centres; pollution = e-waste toxic materials; resource depletion = rare metal mining. Then know sustainable solutions to counter each one.
⚠️ Common Mistakes
Confusing e-waste (discarded devices) with energy waste (wasted electricity)
Not mentioning specific toxic materials in e-waste — lead, mercury, cadmium score marks
Thinking cloud computing has NO environmental impact — it still uses energy, just more efficiently shared
Forgetting that manufacturing devices has an environmental cost before they even reach the consumer
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Worksheet — 5.3b Environmental Impact
8 Edexcel-style questions · instantly marked
Q1State two environmental problems caused by data centres.[2]
✅ Mark scheme
Any two: high energy consumption contributing to carbon emissions [1]; large amounts of water used for cooling systems [1]; heat generated requires energy-intensive cooling [1].
Q2What is e-waste and why is it harmful to the environment?[3]
✅ Mark scheme
E-waste is discarded electronic devices [1]; harmful because they contain toxic materials such as lead, mercury, and cadmium [1]; these can leach into soil and groundwater from landfill sites, causing environmental and health damage [1].
Q3Explain how virtualisation can reduce the environmental impact of computing.[3]
✅ Mark scheme
Virtualisation allows multiple virtual machines to run on a single physical server [1]; this reduces the total number of physical servers needed [1]; leading to lower energy consumption, less cooling required, and less hardware waste [1].
Q4How does mining raw materials for devices contribute to environmental damage? Name one specific material and its impact.[3]
✅ Mark scheme
Mining rare materials causes habitat destruction and pollution [1]; coltan mining (used in capacitors) has been linked to rainforest destruction in Congo [1]; or: lithium mining (for batteries) depletes local water supplies in dry regions [1].
Q5Give two ways a school could reduce the environmental impact of its computing infrastructure.[4]
✅ Mark scheme
Any two: use energy-efficient/Energy Star rated devices [1]; which use less power during use and standby, reducing electricity bills and carbon footprint [1]; implement power management/sleep mode on unused computers [1]; reduces energy waste when devices are idle [1]. (Other valid: e-recycling old devices, migrating to cloud-based services, buying refurbished equipment.)
Q6Why might 'cloud computing' be considered more environmentally sustainable than individual organisations running their own servers?[2]
✅ Mark scheme
Cloud providers share infrastructure among many organisations [1]; this consolidation means fewer total servers are needed than if each organisation ran their own — reducing energy consumption, hardware waste, and cooling requirements [1].
Q7Approximately what percentage of global CO₂ emissions does the ICT sector contribute? What major industry is it comparable to?[2]
✅ Mark scheme
The ICT sector accounts for approximately 2–4% of global CO₂ emissions [1]; comparable to the aviation industry [1].
Q8Discuss whether individuals can make a meaningful difference to the environmental impact of computing. Give at least two specific actions.[4]
✅ Mark scheme
Yes, individuals can help: extending device lifespan by repairing rather than replacing reduces manufacturing demand and e-waste [1]; using e-recycling schemes when disposing of old devices ensures toxic materials are handled safely [1]; enabling sleep mode/power management reduces idle energy use [1]; choosing energy-efficient products [1]. However, the biggest impacts come from corporate decisions about data centre energy sources and device design, so individual actions alone have limited effect [1]. Max 4.
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Mini Test — Environmental Impact
Timed exam-style test.
⏱10:00
Section A — Multiple Choice [5 marks]
Q1E-waste is harmful to the environment mainly because:[1]
Q3The ICT sector's carbon footprint is comparable to that of:[1]
Q4Which of the following is a sustainable computing practice?[1]
Q5Mining coltan for use in electronic capacitors is associated with:[1]
Section B — Short Answer
Q6Describe three different environmental impacts of computing technology.[3]
Mark schemeEnergy consumption: data centres and devices use vast amounts of electricity [1]; often generated from fossil fuels, contributing to carbon emissions/climate change [1]; E-waste: discarded electronics contain toxic materials (lead, mercury) [1]; these pollute landfill, soil, and water supplies [1]; Raw material extraction: mining rare metals (coltan, lithium) causes habitat destruction [1]; mining processes pollute local environments and deplete water supplies [1].
Q7Explain how a large technology company could reduce the environmental impact of its data centres.[2]
Mark schemePower data centres with renewable energy (solar/wind) [1]; reducing carbon footprint from electricity generation [1]; use virtualisation to run multiple services on fewer physical servers [1]; reducing hardware count, energy use and cooling requirements [1]. (Other valid: invest in more efficient cooling systems; locate data centres in cold climates to reduce cooling; purchase carbon offsets; use waste heat for local heating.)