1. ROCKS AND MINERALS CHAINS

Chain: Magma → igneous rock

• Magma is molten rock below the Earth’s surface.

• Magma cools.

• The cooled magma solidifies.

• Crystals form.

• Igneous rock is produced.

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Chain: Lava → extrusive igneous rock

• Lava erupts onto the Earth’s surface.

• It cools quickly.

• Small crystals form.

• Extrusive igneous rock is produced.

• Example:

  • basalt

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Chain: Magma underground → intrusive igneous rock

• Magma cools slowly underground.

• Crystals have more time to grow.

• Large crystals form.

• Intrusive igneous rock is produced.

• Example:

  • granite

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Chain: Sediment → sedimentary rock

• Rocks are weathered into small particles.

• Particles are transported by water/wind/ice.

• Sediments are deposited in layers.

• Compaction squeezes sediments together.

• Cementation binds particles.

• Sedimentary rock forms.

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Chain: Existing rock → metamorphic rock

• Existing rock is buried deep underground.

• Heat and pressure increase.

• Minerals inside the rock are changed.

• The rock becomes harder or recrystallised.

• Metamorphic rock forms.

---

Chain: Weathering → smaller rock fragments

• Rocks are exposed to air, water and temperature changes.

• They break down physically or chemically.

• Smaller fragments form.

• These fragments can be transported.

• Sediments may later form sedimentary rock.

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Chain: Erosion → sediment movement

• Weathered material is loosened.

• Wind, rivers, waves or ice move the material.

• Soil and rock particles are removed.

• Landforms change.

• Sediment may be deposited elsewhere.

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2. MINERAL RESOURCE CHAINS

Chain: Minerals → economic development

• Minerals are extracted from the ground.

• They are sold or used in industry.

• Exports may increase.

• Government and companies earn income.

• Jobs are created.

• Economic development may increase.

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Chain: Minerals → manufacturing

• Minerals provide raw materials.

• These raw materials are processed.

• Industries make goods such as batteries, electronics, machinery or construction materials.

• Manufacturing output increases.

• Trade and employment increase.

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Chain: Mineral extraction → local jobs

• A mine needs workers.

• Jobs are created in extraction, transport and processing.

• Local people earn wages.

• Spending in local shops/services increases.

• Local economy grows.

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Chain: Mineral extraction → infrastructure

• Mines need roads, ports, electricity and water.

• Infrastructure is built or improved.

• Local communities may also use this infrastructure.

• Transport and trade improve.

• Development increases.

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Chain: Mineral dependence → economic risk

• A country relies heavily on minerals.

• Global mineral prices may fall.

• Export income decreases.

• Jobs may be lost.

• The economy becomes unstable.

---

3. MINING BENEFIT CHAINS

Chain: Mining → employment

• Mines require workers.

• People are employed in extraction, transport and processing.

• Household income increases.

• Poverty may decrease.

• Local living standards may improve.

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Chain: Mining → export income

• Minerals are sold to other countries.

• Foreign currency enters the country.

• Government may earn taxes.

• Money can be spent on services and infrastructure.

• Economic growth may increase.

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Chain: Mining → industrial growth

• Minerals supply raw materials.

• Factories use these raw materials.

• More goods are produced.

• Industrial sector expands.

• GDP may increase.

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Chain: Mining → energy supply

• Coal, oil, gas or uranium may be extracted.

• These resources can generate electricity.

• More homes and industries receive power.

• Productivity increases.

• Economic development improves.

---

4. MINING ENVIRONMENTAL DAMAGE CHAINS

Chain: Mining → habitat destruction

• Vegetation is cleared before mining.

• Soil and rock are removed.

• Animal habitats are destroyed.

• Species lose food and shelter.

• Biodiversity decreases.

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Chain: Mining → soil erosion

• Vegetation and topsoil are removed.

• Soil is left exposed.

• Rain and wind remove loose soil.

• Fertile topsoil is lost.

• Land becomes less suitable for plants.

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Chain: Mining → water pollution

• Mining waste may contain toxic chemicals or metals.

• Rainwater washes these into rivers or groundwater.

• Water quality decreases.

• Aquatic organisms may die.

• Drinking water may become unsafe.

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Chain: Mining → air pollution

• Dust is released from blasting, drilling and transport.

• Machinery burns fossil fuels.

• Particulates and gases enter the air.

• Respiratory problems may increase.

• Air quality decreases.

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Chain: Mining → landscape scarring

• Large pits or spoil heaps are created.

• Natural landscapes are damaged.

• Tourism or farming value may decrease.

• Visual pollution increases.

• Land may remain damaged for years.

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Chain: Mining → noise pollution

• Explosions, drilling and heavy machinery create noise.

• Wildlife may be disturbed.

• People nearby may suffer stress or sleep disturbance.

• Quality of life decreases.

• Some species may leave the area.

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Chain: Mining → loss of farmland

• Land is used for extraction instead of farming.

• Soil may be removed or contaminated.

• Food production decreases.

• Farmers may lose income.

• Food insecurity may increase.

---

5. SURFACE MINE RESTORATION CHAINS

Chain: Disused surface mine → restoration needed

• Mining leaves bare rock, steep sides and spoil heaps.

• Soil may be poor or contaminated.

• Plants may not grow naturally.

• Wildlife cannot return easily.

• Restoration is needed before reintroducing species.

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Chain: Mine restoration → safer habitat

• Steep slopes are made stable.

• Contaminated waste is removed or covered.

• Topsoil is replaced.

• Native vegetation is planted.

• Animals can be introduced safely.

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Chain: Adding topsoil → plant growth

• Topsoil contains nutrients and organic matter.

• Seeds and plants can grow.

• Roots stabilise the soil.

• Habitats begin to recover.

• Food and shelter become available for animals.

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Chain: Planting native vegetation → biodiversity recovery

• Native plants are planted.

• Insects and herbivores get food.

• Birds and predators may return.

• Food webs develop again.

• Biodiversity increases.

---

Chain: Restored mine → conservation area

• Damaged land is repaired.

• Native plants and animals are introduced.

• Human activity may be controlled.

• Species populations can recover.

• The area may become a useful habitat.

---

6. SUSTAINABLE MINERAL USE CHAINS

Chain: Recycling metals → less mining

• Metals are collected from waste products.

• They are melted and reused.

• Fewer new minerals need to be extracted.

• Habitat destruction and pollution decrease.

• Mineral resources last longer.

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Chain: Reusing products → reduced mineral demand

• Products are repaired or reused.

• Fewer new products are bought.

• Demand for raw materials falls.

• Mining pressure decreases.

• Waste also decreases.

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Chain: Efficient extraction → less waste

• Better technology extracts more useful mineral from rock.

• Less raw material is wasted.

• Fewer areas need to be mined.

• Pollution and land damage decrease.

• Mineral use becomes more sustainable.

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Chain: Laws and quotas → controlled extraction

• Government limits mining activity.

• Companies must follow rules.

• Over-extraction is reduced.

• Land restoration may be required.

• Environmental damage decreases.

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Chain: Alternatives → mineral conservation

• Alternative materials are used.

• Demand for scarce minerals decreases.

• Less mining is needed.

• Resources last longer.

• Environmental damage is reduced.

---

7. MERCURY / TOXIC METAL CHAINS

Chain: Mercury pollution → water contamination

• Mercury enters rivers or seas from mining/industry.

• Water becomes contaminated.

• Aquatic organisms absorb mercury.

• Fish may become unsafe to eat.

• Human health may be affected.

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Chain: Mercury → bioaccumulation

• Small organisms absorb mercury.

• Mercury is stored in body tissues.

• It is not removed quickly.

• Concentration increases over time.

• Organisms may become poisoned.

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Chain: Mercury → biomagnification

• Small contaminated organisms are eaten by larger organisms.

• Predators eat many contaminated prey.

• Mercury concentration increases at higher trophic levels.

• Top predators and humans receive the highest dose.

• Health problems may occur.

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Chain: Mercury contamination → fishing economy damage

• Fish become unsafe to eat.

• Demand for fish decreases.

• Fishermen lose income.

• Fish exports may fall.

• Local economy suffers.

---

8. NON-RENEWABLE ENERGY CHAINS

Chain: Fossil fuels → electricity

• Coal, oil or natural gas is burned.

• Heat energy is released.

• Water is heated to produce steam.

• Steam turns turbines.

• Turbines turn generators.

• Electricity is produced.

---

Chain: Fossil fuels → economic development

• Fossil fuels provide reliable energy.

• Factories, transport and homes receive power.

• Production increases.

• Jobs and income rise.

• Economic development improves.

---

Chain: Fossil fuels → carbon dioxide

• Fossil fuels contain carbon.

• Burning them releases carbon dioxide.

• Carbon dioxide is a greenhouse gas.

• More heat is trapped in the atmosphere.

• Global warming increases.

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Chain: Fossil fuels → acid rain

• Burning coal/oil may release sulfur dioxide.

• Vehicles and power stations release nitrogen oxides.

• These gases react with water in the atmosphere.

• Acid rain forms.

• Lakes, forests, soils and buildings are damaged.

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Chain: Fossil fuels → respiratory disease

• Burning fossil fuels releases particulates and pollutants.

• These enter the lungs.

• Asthma, bronchitis and other respiratory diseases may increase.

• Healthcare costs rise.

• Quality of life decreases.

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Chain: Fossil fuels → finite resource problem

• Fossil fuels take millions of years to form.

• They are used much faster than they form.

• Reserves decrease.

• Extraction becomes more difficult and expensive.

• Countries may face energy insecurity.

---

9. COAL CHAINS

Chain: Coal → cheap electricity

• Coal is widely available in some countries.

• It can be burned in power stations.

• Electricity is produced continuously.

• It is reliable and relatively cheap.

• But it causes high pollution.

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Chain: Coal → high carbon emissions

• Coal has high carbon content.

• Burning coal releases large amounts of carbon dioxide.

• Greenhouse effect increases.

• Climate change worsens.

• Extreme weather and sea level rise may increase.

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Chain: Coal mining → land damage

• Land is cleared for mines.

• Surface mining creates large pits.

• Waste rock is dumped.

• Habitats are destroyed.

• Landscape is damaged.

---

10. OIL CHAINS

Chain: Oil → transport energy

• Oil is refined into petrol/diesel.

• Vehicles burn fuel.

• Transport becomes possible.

• Trade and commuting increase.

• Carbon dioxide and air pollutants are released.

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Chain: Oil spill → marine damage

• Oil leaks into the sea.

• It spreads over the water surface.

• Birds’ feathers and mammals’ fur become coated.

• Animals lose insulation or cannot fly/swim.

• Deaths increase and food chains are affected.

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Chain: Oil dependence → economic risk

• A country depends on oil imports/exports.

• Oil prices change suddenly.

• Fuel costs and production costs change.

• Inflation or income loss may occur.

• Economy becomes vulnerable.

---

11. NATURAL GAS CHAINS

Chain: Natural gas → electricity

• Natural gas is burned.

• Heat energy is produced.

• Turbines/generators produce electricity.

• It can supply power quickly.

• It releases less carbon dioxide than coal, but still contributes to climate change.

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Chain: Natural gas → methane leakage

• Methane may leak during extraction/transport.

• Methane is a strong greenhouse gas.

• More heat is trapped in the atmosphere.

• Global warming increases.

• Climate change impacts worsen.

---

12. NUCLEAR ENERGY CHAINS

Chain: Nuclear fuel → electricity

• Uranium atoms split in nuclear fission.

• Heat energy is released.

• Water turns into steam.

• Steam turns turbines.

• Generators produce electricity.

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Chain: Nuclear energy → low carbon electricity

• Nuclear power does not burn fossil fuels during operation.

• Little carbon dioxide is released during electricity generation.

• Greenhouse gas emissions are lower.

• Climate change contribution is reduced.

• It can provide large-scale reliable electricity.

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Chain: Nuclear energy → radioactive waste problem

• Nuclear reactions produce radioactive waste.

• Waste remains dangerous for a long time.

• It must be stored securely.

• Leaks could harm humans and ecosystems.

• Management is expensive and high risk.

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Chain: Nuclear accident → contamination

• A nuclear accident may release radiation.

• Soil, water and air may be contaminated.

• People and wildlife may be exposed.

• Cancer and genetic damage risk increases.

• Large areas may become unsafe.

---

13. RENEWABLE ENERGY CHAINS

Chain: Renewable energy → reduced carbon emissions

• Renewable energy does not require burning fossil fuels during operation.

• Less carbon dioxide is released.

• Greenhouse effect increases more slowly.

• Climate change is reduced.

• Air quality may improve.

---

Chain: Renewable energy → energy security

• Local renewable resources are used.

• Fewer fossil fuels need to be imported.

• Country becomes less dependent on global fuel prices.

• Energy supply becomes more secure.

• Economy may become more stable.

---

Chain: Renewable energy → high start-up cost

• Equipment such as turbines, panels or dams is expensive.

• Skilled workers may be needed.

• Batteries or backup systems may be required.

• Poorer countries may struggle to invest.

• Development of renewables may be slow.

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Chain: Renewable energy → weather dependence

• Solar depends on sunlight.

• Wind depends on wind speed.

• HEP depends on rainfall and river flow.

• Output may change daily or seasonally.

• Backup electricity may be needed.

---

14. HYDROELECTRIC POWER CHAINS

Chain: HEP → electricity generation

• Water is stored at a higher level.

• Water flows downhill through pipes.

• Moving water turns turbines.

• Turbines turn generators.

• Electricity is produced.

---

Chain: HEP → low greenhouse gas emissions

• HEP does not burn fossil fuels during operation.

• Less carbon dioxide is released.

• Contribution to climate change is lower.

• Air pollution is reduced.

• Respiratory problems may decrease.

---

Chain: HEP → reliable renewable energy

• Water can be stored in reservoirs.

• Electricity can be produced when needed.

• HEP is more reliable than some weather-dependent renewables.

• It can meet demand quickly.

• Energy security improves.

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Chain: HEP → habitat loss

• A dam blocks a river.

• A reservoir floods land upstream.

• Forests, farmland and habitats may be submerged.

• Species lose habitats.

• Biodiversity may decrease.

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Chain: HEP → displacement of people

• Reservoirs flood villages or farmland.

• People must move away.

• Homes and livelihoods are lost.

• Compensation may be needed.

• Social conflict may occur.

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Chain: HEP → reduced downstream flow

• Water is held behind a dam.

• Less water flows downstream.

• Wetlands and river ecosystems receive less water.

• Fish breeding may be affected.

• Farmers downstream may face water shortages.

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Chain: HEP → sediment trapping

• Sediment is trapped behind the dam.

• Downstream floodplains receive fewer nutrients.

• Soil fertility may decrease.

• Riverbanks/coasts may erode.

• Agricultural productivity may fall.

---

15. SOLAR ENERGY CHAINS

Chain: Solar energy → clean electricity

• Solar panels absorb sunlight.

• Light energy is converted into electricity.

• No fossil fuel is burned during operation.

• Carbon dioxide emissions are low.

• Air pollution decreases.

---

Chain: Solar energy → weather limitation

• Solar panels need sunlight.

• Output decreases at night or during cloudy weather.

• Electricity production becomes unreliable.

• Batteries or backup power are needed.

• Costs increase.

---

Chain: Solar energy → land use issue

• Large solar farms need large areas of land.

• Land may be taken from farming or habitats.

• Ecosystems may be disturbed.

• Food production may decrease.

• Land-use conflict may occur.

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Chain: Solar panels → high initial cost

• Solar panels and batteries are expensive.

• Installation needs skilled workers.

• Poor communities may not afford them.

• Investment may be slow.

• Fossil fuels may continue to be used.

---

16. WIND ENERGY CHAINS

Chain: Wind energy → electricity

• Wind turns turbine blades.

• Turbine blades turn a generator.

• Electricity is produced.

• No fossil fuel is burned during operation.

• Carbon emissions are low.

---

Chain: Wind energy → unreliable supply

• Wind speed changes.

• Turbines do not work well when wind is too weak or too strong.

• Electricity output fluctuates.

• Backup energy is needed.

• Supply may be less reliable.

---

Chain: Wind farms → visual/noise impact

• Large turbines change the landscape.

• Turbines create noise.

• Local people may object.

• Tourism or house values may be affected.

• Planning permission may be difficult.

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Chain: Wind farms → bird/bat deaths

• Birds or bats may collide with turbine blades.

• Some species may avoid the area.

• Local biodiversity may decrease.

• Ecosystems may be disrupted.

• Careful site selection is needed.

---

17. GEOTHERMAL ENERGY CHAINS

Chain: Geothermal energy → electricity

• Hot rocks underground heat water.

• Water becomes steam.

• Steam rises through pipes.

• Steam turns turbine blades.

• Turbines turn generators.

• Electricity is produced.

---

Chain: Geothermal energy → useful in volcanic areas

• Volcanic areas have hot rocks close to the surface.

• Less drilling may be needed.

• Steam/hot water is easier to access.

• Electricity can be produced more cheaply.

• Energy supply becomes reliable.

---

Chain: Geothermal energy → limited locations

• Some places are not near plate boundaries.

• Hot rocks may be too deep.

• Drilling becomes expensive or impossible.

• Skilled technology may be unavailable.

• Geothermal energy cannot be used everywhere.

---

Chain: Geothermal energy → low emissions

• No fossil fuel is burned during generation.

• Carbon dioxide emissions are low.

• Air pollution is reduced.

• Climate change contribution decreases.

• It is more sustainable than fossil fuels.

---

18. BIOFUELS CHAINS

Chain: Biofuel crops → renewable fuel

• Crops such as sugar cane, maize or oil palm are grown.

• Plant material is processed into fuel.

• Fuel is burned for transport or electricity.

• Crops can be regrown.

• Fuel supply is renewable if managed sustainably.

---

Chain: Biofuels → reduced fossil fuel use

• Biofuels replace petrol/diesel/coal.

• Less fossil fuel is burned.

• Fossil fuel reserves last longer.

• Carbon emissions from fossil fuels decrease.

• Energy security may improve.

---

Chain: Biofuel crops → food insecurity

• Land is used for fuel crops instead of food crops.

• Food production decreases.

• Food prices may increase.

• Poor people may struggle to afford food.

• Food insecurity rises.

---

Chain: Biofuel crops → deforestation

• Forests may be cleared to grow fuel crops.

• Habitats are destroyed.

• Biodiversity decreases.

• Stored carbon is released.

• Climate change may worsen.

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Chain: Biofuels → not fully carbon neutral

• Crops absorb carbon dioxide while growing.

• But farming, processing and transport use energy.

• Fertilisers and machinery may release greenhouse gases.

• Net emissions may still occur.

• Environmental benefit depends on how biofuels are produced.

---

19. TIDAL AND WAVE ENERGY CHAINS

Chain: Tidal energy → predictable electricity

• Tides rise and fall due to gravitational pull.

• Moving water turns turbines.

• Electricity is generated.

• Tides are predictable.

• Supply can be planned.

---

Chain: Tidal energy → ecosystem disruption

• Barrages or turbines are built in coastal areas.

• Water flow and sediment movement change.

• Fish migration may be affected.

• Coastal habitats may be damaged.

• Biodiversity may decrease.

---

Chain: Wave energy → renewable electricity

• Waves move floating devices or turbines.

• Movement generates electricity.

• No fossil fuel is burned during operation.

• Carbon emissions are low.

• Coastal areas may gain renewable power.

---

Chain: Wave energy → location limitation

• Strong regular waves are needed.

• Not all coasts have suitable wave energy.

• Equipment must survive storms and saltwater corrosion.

• Maintenance costs can be high.

• Use may be limited.

---

20. ELECTRICITY CONSUMPTION CHAINS

Chain: More industry → more electricity demand

• Factories use machinery, heating, cooling and lighting.

• Industrial production increases.

• Electricity demand rises.

• More power stations may be needed.

• Fossil fuel use and emissions may increase if renewables are not used.

---

Chain: Higher income → more domestic electricity use

• People can afford appliances.

• More homes use refrigerators, air conditioning, heaters and electronics.

• Domestic electricity use increases.

• Demand on the grid rises.

• More energy generation is needed.

---

Chain: Cold climate → high electricity use

• Homes need heating.

• Lighting may be needed for long dark periods.

• More electricity is consumed.

• Energy demand rises in winter.

• Costs for households increase.

---

Chain: Hot climate → high electricity use

• Air conditioning and fans are used.

• Refrigeration demand increases.

• Electricity consumption rises.

• Peak demand may overload supply.

• More power generation is needed.

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Chain: Transport sector in MEDC → higher electricity/fuel use

• MEDCs often have more vehicles and public transport systems.

• More commuting and trade occur.

• Transport uses more energy.

• Emissions may increase.

• Cleaner transport may be needed.

---

Chain: Transport sector in LEDC → lower electricity use

• Fewer electric trains, trams and vehicles may exist.

• Less infrastructure is available.

• Transport may use less electricity.

• But older vehicles may still cause high pollution.

• Development affects energy demand.

---

21. REDUCING DOMESTIC ELECTRICITY USE CHAINS

Chain: Turning off appliances → less electricity demand

• Lights and devices are switched off when not needed.

• Less electricity is used.

• Power stations burn less fuel.

• Carbon emissions decrease.

• Household bills fall.

---

Chain: Energy-efficient appliances → lower consumption

• Efficient appliances use less electricity for the same task.

• Total domestic demand decreases.

• Fewer fossil fuels are burned.

• Carbon dioxide emissions fall.

• Costs decrease over time.

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Chain: Insulation → less heating/cooling

• Insulation reduces heat transfer.

• Homes stay warmer in winter and cooler in summer.

• Less heating or air conditioning is needed.

• Electricity/fuel use decreases.

• Carbon emissions decrease.

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Chain: Double glazing → less heat loss

• Double glazing traps air between glass layers.

• Heat loss through windows decreases.

• Less heating is required.

• Energy consumption falls.

• Bills and emissions decrease.

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Chain: Better building orientation → natural light/heat

• Windows face useful sunlight direction.

• Natural light enters the building.

• Less artificial lighting is needed.

• Solar heat may reduce heating demand.

• Electricity use decreases.

---

22. CARBON DIOXIDE REDUCTION CHAINS

Chain: Reducing fossil fuel use → lower CO2

• Less coal, oil and gas are burned.

• Less carbon dioxide is released.

• Greenhouse effect strengthens more slowly.

• Global warming is reduced.

• Climate change impacts are limited.

---

Chain: Renewable energy → lower CO2

• Solar/wind/HEP/geothermal replace fossil fuels.

• Electricity is generated with low emissions.

• Carbon dioxide output falls.

• Air pollution also decreases.

• Public health may improve.

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Chain: Reforestation → lower CO2

• Trees are planted.

• Trees absorb carbon dioxide during photosynthesis.

• Carbon is stored in biomass.

• Atmospheric carbon dioxide decreases.

• Climate change is reduced.

---

Chain: Energy efficiency → lower CO2

• Machines/buildings use less energy.

• Less electricity or fuel is needed.

• Less fossil fuel is burned.

• Carbon dioxide emissions fall.

• Climate targets become easier to meet.

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Chain: Public transport → lower CO2

• More people travel in fewer vehicles.

• Fuel use per person decreases.

• Traffic congestion may decrease.

• Carbon dioxide emissions fall.

• Air quality improves.

---

Chain: Electric vehicles → lower urban air pollution

• Electric vehicles do not burn petrol/diesel directly.

• Exhaust emissions in cities decrease.

• Air quality improves.

• Respiratory disease may decrease.

• But benefit depends on how electricity is generated.

---

23. WHY COUNTRIES MAY BE SLOW TO INVEST IN RENEWABLES

Chain: High cost → slow renewable investment

• Renewable technology has high start-up costs.

• Solar panels, turbines and batteries are expensive.

• Government or businesses may lack funds.

• Fossil fuels remain cheaper in the short term.

• Renewable investment is delayed.

---

Chain: Existing fossil fuels → slow renewable investment

• A country already has coal/oil/gas reserves.

• Existing power stations and jobs depend on fossil fuels.

• Switching to renewables may be politically/economically difficult.

• Fossil fuel use continues.

• Renewable transition slows.

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Chain: Lack of skilled workers → slow renewable investment

• Renewable projects need engineers and technicians.

• Skilled labour may be limited.

• Equipment may need to be imported.

• Maintenance becomes difficult.

• Investment becomes risky or expensive.

---

Chain: Unreliable renewables → slow investment

• Solar and wind depend on weather.

• Output may be inconsistent.

• Batteries or backup power are needed.

• Total cost increases.

• Countries may delay investment.

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Chain: Land requirement → slow investment

• Solar and wind farms need large areas.

• Land may already be used for farming, housing or conservation.

• Local people may object.

• Planning becomes difficult.

• Renewable projects are delayed.

---

24. ENERGY SECURITY CHAINS

Chain: Energy security → stable economy

• A country has reliable access to energy.

• Homes, transport and industries can operate.

• Production continues.

• Jobs and income are protected.

• Economic stability improves.

---

Chain: Energy imports → vulnerability

• A country relies on imported fuel.

• Prices may rise suddenly.

• Supply may be disrupted by conflict or trade problems.

• Electricity and transport costs increase.

• Economy becomes vulnerable.

---

Chain: Local renewable energy → energy independence

• A country uses its own wind, sunlight, rivers or geothermal heat.

• Imports decrease.

• Money stays inside the country.

• Energy supply becomes more secure.

• Long-term sustainability improves.

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25. QUICK EXAM CHAINS FOR ENERGY QUESTIONS

“Explain why HEP is useful”

• Water is renewable.

• Moving water turns turbines.

• Electricity is produced without burning fossil fuels.

• Carbon dioxide emissions are low.

• It provides a sustainable energy supply.

---

“Explain why solar power may be unsuitable”

• Solar panels need sunlight.

• Cloudy weather or long winters reduce output.

• No electricity is produced at night.

• Batteries are expensive.

• Backup power is needed.

---

“Explain why fossil fuels are harmful”

• Fossil fuels are burned.

• Carbon dioxide is released.

• Greenhouse effect increases.

• Global temperatures rise.

• Climate change causes droughts, floods and sea level rise.

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“Explain why reducing CO2 is important”

• Carbon dioxide is a greenhouse gas.

• It traps heat in the atmosphere.

• Higher concentrations increase global warming.

• Climate change impacts become worse.

• Reducing emissions protects people and ecosystems.

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“Explain why mining can damage ecosystems”

• Vegetation is cleared.

• Habitats are destroyed.

• Soil erosion increases.

• Water may be polluted by waste.

• Biodiversity decreases.

---

“Explain how minerals can be used sustainably”

• Recycle metals.

• Reuse products.

• Improve extraction efficiency.

• Use alternatives.

• Restore mined land.