AQA GCSE Geography Paper 1Living with the Physical Environment — every question, answered

Mitigation strategies like the carbon capture plant in Figure 6 tackle climate change at its source. Carbon capture and storage technology traps carbon dioxide from power stations and industrial plants before it reaches the atmosphere, converts it to liquid form, and injects it into sedimentary rock, and the technology can now capture up to around 90% of the CO2 that would otherwise be released. Planting trees works the same way over a longer timescale, since growing forests act as carbon sinks that absorb CO2 through photosynthesis.

But mitigation alone cannot undo warming that has already started, which is why adaptation matters just as much. Figure 6 also shows farming adapting to a changing climate, since some crops may no longer suit a warmer or drier area while drought-resistant plants and crops like oranges and grapes become viable where rainfall is lower, while coastal communities at risk from rising sea levels are building sea defences or raising houses on stilts. Because some warming is now unavoidable even if emissions stopped tomorrow, adaptation strategies like these are just as necessary as mitigation, so I agree that managing climate change genuinely needs both.

The strongest evidence for a human cause is the burning of fossil fuels shown by Figure 4, since fossil fuels account for over half of all global greenhouse gas emissions once they are used for transport, heating, and generating electricity. Deforestation adds to this, because cutting down trees removes a carbon sink that would otherwise absorb CO2, and burning the cleared vegetation releases even more CO2 directly into the atmosphere, so this is a second, distinct human driver working alongside fossil fuel use rather than the same cause repeated.

However, natural factors have driven climate change long before industrialisation. Figure 4 also points to volcanic activity, which releases ash that can reflect the Sun's rays and cool the planet in the short term, but over time releases greenhouse gases like carbon dioxide that trap heat and warm it instead. Longer natural cycles add to this picture too, since the Earth's orbit shifts from a circular to an oval shape roughly every 100,000 years in the Milankovitch cycle, changing how much solar energy the planet receives, and solar output itself varies over an 11 year sunspot cycle. Since the start of the industrial era around 1750, though, the scale and speed of warming vastly exceeds what these natural causes alone can explain, so on balance I judge that climate change today is very largely the result of human actions, even though natural processes still play a background role.

The 2009 L'Aquila earthquake in Italy, a wealthier HIC, measured magnitude 6.3 and killed around 300 people while making over 60,000 homeless. In stark contrast, the 2015 Gorkha earthquake in Nepal, a much poorer country, measured a far more powerful magnitude 7.8 and killed over 8,000 people, making more than a million homeless. Both countries declared a state of emergency and received international assistance, but Nepal's poorer infrastructure and weaker building regulations meant far more structures collapsed even accounting for the stronger shaking.

However, wealth is not the only factor at work here, since the Nepal earthquake was roughly 31 times more powerful than the one in Italy, based on the way the magnitude scale works, so raw earthquake strength alone could explain much of the death toll gap regardless of income. I therefore judge that wealth does strongly affect how well a country prepares for, responds to, and recovers from a tectonic hazard, but the effects of any single earthquake also depend heavily on its magnitude and depth, so wealth only partly explains the contrast between these two events.

At a destructive margin, shown in Figure 6, two plates move towards each other and the denser oceanic plate is subducted beneath the lighter continental plate, sinking into the mantle where it melts. This hot magma rises through the overlying crust and becomes increasingly viscous as it nears the surface, so when it does erupt it forms steep-sided composite volcanoes with violent eruptions, ash falls, and pyroclastic flows. Earthquakes also occur here because as the plates converge, pressure builds up until the rock fractures, with some quakes shallow near the surface and others much deeper within the subduction zone itself.

At a constructive margin, by contrast, two plates move apart and magma rises to fill the gap, cooling to form new crust. Because this magma is much less viscous, it produces gentler, wide, basic lava cones rather than explosive volcanoes. Earthquakes at constructive margins are usually low in magnitude, caused by faulting as the plates pull apart, and tend to be shallow. Naming Iceland as a real example of a constructive margin, where both gentle volcanic activity and minor earthquakes are well documented, shows the process is not just theoretical.

Cyclone Idai's primary effects were severe because of the storm's own power: wind speeds of up to 200 km per hour combined with over 150 mm of rain in 24 hours caused widespread building collapse and the 1300 deaths recorded, largely from flying debris and drowning as the storm surge created what the factfile calls 'inland oceans' across the low-lying land around Beira.

The secondary effects were made worse by Mozambique's low income, since a GNI of only US$1153 per person per year means little money is available for storm shelters, monitoring, or rapid recovery, and with 80% of the population living on less than US$2 a day, over a million displaced people had very little of their own resources to fall back on. This is exactly why the cholera outbreak affecting 5000 people followed the flooding, since damaged water and sanitation infrastructure could not be repaired quickly in such a poor country, showing that a storm's severity depends on the wealth of the area it hits as much as on its own wind speed and rainfall.

One real advantage is that volcanic soils are extremely fertile once weathered, since nutrient-rich volcanic ash breaks down into rich farmland, which is why areas near Mount Vesuvius in Italy grow olives, vines and citrus fruit on the volcanic slopes despite the eruption risk. Geothermal energy is a second advantage in volcanic areas, and in Iceland this provides around 28% of the country's total energy, including heating pavements in the capital, Reykjavik, during winter.

The disadvantages can be severe, though: ground shaking in earthquake zones causes buildings, bridges and power lines to collapse, and gas and water mains to fracture, leading to immediate deaths from crushing and falling debris. Longer term, disease spreads from contaminated water supplies, and unemployment rises as damaged businesses cannot operate, so while volcanic soil and geothermal energy genuinely attract people to these areas, the same tectonic activity can devastate a community in seconds, which is why both sides of this question carry real weight.

Figure 4 shows real evidence on both ends of the extreme weather scale: moorland fires caused by higher summer temperatures and lower rainfall, and flooding caused by higher rainfall and more storm events. Met Office data backs this up, showing the UK has warmed by around 1 degree C since 1980, a change linked to hotter summers and a greater chance of drought, while more winter rain has fallen in heavy events since the 1980s, increasing the frequency of river flooding such as the 2009 Cumbria floods and 2014 Somerset Levels floods.

However, UK weather is naturally very variable, and pointing to just a handful of recent extreme events like Storm Ciara or the Beast from the East is not on its own proof of a long-term trend, since many parts of the country are not experiencing significantly different weather patterns year to year. On balance, I agree that UK weather is becoming more extreme, because the Met Office's own long-term data, not just isolated headline events, shows real increases in both heavy winter rainfall and summer heat, but I recognise that a single wet winter or hot summer alone would not prove this on its own.

Prediction is shown in Figure 5 through the tracking of Cyclone Amphan, where satellite images and computer modelling produced a forecast track and a 'cone of uncertainty' covering the area most likely to be affected, allowing places like Odisha, well outside that cone, to carry on largely as normal without evacuating. Modern supercomputers can now give around five days' warning with a fairly accurate location, giving people real time to board up windows, stockpile supplies, and evacuate if needed.

Protection is shown by the raised cyclone shelter itself, elevated above ground level to keep people safe from flood water, with a reinforced structure able to withstand powerful winds and a flat roof that may allow helicopter access; shelters like these have been genuinely effective in cutting the cyclone death toll in Bangladesh. However, even the best forecasting cannot always predict a storm's exact strength or path in time, and poorer coastal communities may not have enough shelters for everyone, so I judge that protection and prediction together can greatly reduce, but never fully eliminate, the effects of a tropical storm.

Protection reduces earthquake risk through better building design: rubber shock absorbers fitted into a building's foundations absorb the energy of Earth tremors, while steel frames are designed to sway during ground movement rather than snapping, and open assembly areas outside buildings give people somewhere safe to gather during an evacuation.

Planning also reduces risk, since regular earthquake drills in hospitals, schools and other public buildings mean people already know exactly what to do the moment shaking starts, which speeds up evacuation and cuts casualties. Monitoring using seismometers to record earth tremors around a volcano can give some warning before an eruption, even though the exact timing is very hard to predict, so combining planning with monitoring reduces both the immediate and the longer-term danger from a tectonic hazard.

At point Y, Figure 2 shows the denser Nazca Plate being subducted beneath the lighter South American Plate. As the Nazca Plate sinks into the mantle it melts in the subduction zone, and the resulting magma rises up through the overlying crust, sometimes erupting at the surface to form volcanoes, which explains the volcanic activity recorded along this stretch of coast.

Earthquakes happen at the same margin because as the two plates converge, enormous pressure builds up in the rock until it eventually fractures, releasing energy as an earthquake; these can occur at shallow depths right where the plates meet, or much deeper within the subduction zone itself. Because both the volcanic activity and the earthquakes are driven by the same subduction process at Y, this margin experiences frequent tectonic hazards of both types.

Destructive margins occur where two plates move towards each other, and if an oceanic plate collides with a continental plate, the denser oceanic plate is subducted, sinking below the continental plate and down into the Earth's mantle. This causes part of the mantle to melt, and the resulting magma rises up through the overlying crust, eventually erupting at the surface to form volcanoes.

Earthquakes occur at the same margins because as the plates converge, pressure steadily builds up in the surrounding rock, and when this pressure is eventually released it causes the rock to fracture, generating an earthquake. Because destructive margins involve two plates constantly grinding and pushing against each other, this pressure builds up repeatedly, which is why both volcanic eruptions and earthquakes are common along the same destructive boundary.

Lower crop yields, shown affecting Central and South America on Figure 2, will reduce food supplies and increase food insecurity, raising the risk of hunger and malnutrition in areas that are already less able to import food to make up the difference. This links directly to the freshwater shortages shown across Africa on the same map, since a shortage of clean water can also damage health and may even trigger conflict or refugee movements as people are forced to search for water elsewhere.

Coastal erosion, shown affecting small islands such as the Maldives, threatens to submerge low-lying land entirely as sea levels rise, potentially forcing the evacuation of whole island populations, while flood damage elsewhere destroys buildings and can force people to migrate, causing overcrowding wherever they resettle. With a temperature rise of 2.5 degrees C estimated to cut global GNI by up to 2% every year, the economic effects of these events on ordinary people's livelihoods, not just their homes, are a further way climate change reaches people directly.

Reading the graph, August shows around 70 typhoons out of the total of 204. Dividing 70 by 204 gives 0.343, which as a percentage is 34.3%, rounding to 34% to the nearest whole percentage.

Using the scale bar of 0 to 1000 km, I measure only the section of the track marked as hurricane force, from where it strengthens past the Bahamas to where it weakens again further north. This section measures approximately 2900 km, which sits within the accepted range of 2600 to 3200 km for full marks.

Reading the graph, sea ice extent in 1980 was around 7 million km2, and by 2016 it had fallen to around 4 million km2. Subtracting these gives a change of 3 million km2 over the 36 year period.

Ordering the 14 death tolls from lowest to highest gives: 1629, 1833, 2782, 3859, 4234, 5960, 6200, 11400, 14200, 15000, 138366, 138866, 171000, 300000. With 14 values, the median is the average of the 7th and 8th values, which are 6200 and 11400, giving a median of 8800 deaths.

Figure 11's palm oil plantation in Indonesia shows how commercial-scale activity causes major environmental damage: large areas of rainforest are cleared, and because the land only sustains crops for a few years, farmers must clear more forest for new plantations, leaving the exposed soil to erode and chemical fertilisers to leach into the water. In Indonesia specifically, deforestation for palm oil is responsible for around 80% of the whole country's CO2 emissions, making it the third largest emitter of greenhouse gases in the world.

By contrast, the shifting cultivation and ecotourism shown in the same figure have historically had a much smaller environmental impact, since shifting cultivation allows the original cleared area to regenerate once farmers move on, and ecotourism is typically small scale with a focus on conservation. This shows the environmental impact of rainforest economic activities depends heavily on their scale, so I largely agree with the statement, but only for large commercial activities like palm oil and HEP dams, not for small-scale traditional or conservation-focused ones shown in the same figure.

Figure 7 shows rainforests absorb and store carbon dioxide, and around a quarter of all medicines come from rainforest plants, so protecting rainforests preserves resources with real, ongoing global value that clearing the forest destroys permanently. Once biodiversity is lost through habitat destruction, as the figure also states, plant and animal species cannot simply be replaced, which is a strong reason to prioritise protection.

However, Figure 7 also shows that many people have jobs in mining, logging and farming, and that companies pay taxes which fund local services, so economic development genuinely raises living standards for people who live in or near the rainforest. I judge that rainforests need far stronger protection than they currently have, since the environmental losses from large-scale clearance are permanent, but some carefully managed development, such as selective logging or ecotourism, should still be allowed so that local communities are not denied all economic opportunity.

Figure 9's barren desert photograph shows the scale of the challenge: with daily temperatures ranging from over 40 degrees C to below freezing at night, and rainfall below 100 mm a year, providing water for industry or people is genuinely difficult, and the huge, sparsely populated area of somewhere like the Thar Desert, which covers around 200,000 sq km, makes transport and services expensive and slow to reach remote communities.

But Figure 9's second photograph, the gold mine in Western Australia, shows real opportunity can outweigh these challenges when resources are valuable enough: large-scale mining brings a strong financial return despite the harsh environment, generating jobs and investment. The Thar Desert case study shows the same pattern on a smaller scale, since limestone and gypsum mining supports the construction industry there, and a genuine, growing tourism trade has developed around the honeypot city of Jaisalmer, even though development beyond that city remains very limited. I judge that hot deserts offer real economic opportunity, but only where the value of the resource or attraction is high enough to justify overcoming the extreme challenges.

In the south west United States, a hot desert HIC example, opportunities for development include large-scale commercial farming supported by irrigation, extensive mining activity, and tourism developed on a large scale, including retirement communities built to take advantage of the warm, dry climate. In a poorer example like the Thar Desert, opportunities include subsistence and commercial farming supported by irrigation, mining of limestone and gypsum for the construction industry, hydroelectric power, and a growing tourism industry.

The degree to which these opportunities can actually be developed depends on the availability of water, the physical terrain, extremes of temperature, the technology available, and how much money is invested, so while hot deserts have real economic potential across farming, mining and tourism, that potential is only partly realised because the desert ecosystem is fragile and development is not always sustainable in the long term.

The Great Green Wall scheme, shown in Figure 8, plants trees across the southern edge of the Sahara to reduce desertification, since the trees counter soil erosion, slow wind speeds and physically stop the desert spreading further; by 2030 the scheme aims to restore 100 million hectares of degraded land, and has already restored 15 million hectares in Ethiopia and planted 11.4 million trees in Senegal.

Building rock walls, or bunds, shown in the same figure, is an appropriate low-cost technology that follows the contour of the land to capture rainwater running downhill, trapping sediment that would otherwise wash away and building up a good depth of soil for cultivation. Together, these two strategies show how both large-scale tree planting and small-scale local technology can reduce environmental damage on a desert fringe, tackling the problem from very different angles but with the same underlying goal of holding soil and water in place.

In the Thar Desert, temperatures can exceed 50 degrees C in summer, making it too hot for people to farm, work in mines, or act as tourist guides during those months, which directly limits how much economic activity can take place there. Inaccessibility compounds this problem, since the desert covers around 200,000 sq km, most of it reachable only with poor infrastructure, meaning development is concentrated almost entirely around the honeypot city of Jaisalmer while the rest of the desert remains largely undeveloped.

Weighing the two, I judge that inaccessibility is the more important barrier in the Thar Desert, since extreme heat only stops work for part of the year, but poor infrastructure permanently limits access to most of the desert's area, creating greater differences between the wealthy honeypot of Jaisalmer and the rest of the region. Both challenges clearly matter, but a place can adapt working hours around heat far more easily than it can build entirely new infrastructure across 200,000 sq km of harsh terrain.

Figure 6 shows temperatures staying at a consistently high 28 to 29 degrees C all year, so plants can grow continuously without a dormant season, which is why rainforest trees like those shown drop their leaves gradually throughout the year rather than all at once, allowing them to keep photosynthesising and competing for light year round.

With rainfall never falling below around 150 mm even in the driest month, leaves have developed drip tips that channel the constant heavy rain off quickly so the leaf does not break under the weight of water, while buttress roots have evolved to support trees that grow extremely tall, over 50 metres in some cases, in the fierce competition for sunlight created by such favourable, constant growing conditions. These adaptations show how the rainforest's specific combination of constant heat and high rainfall, rather than a general 'hot and wet' climate, shapes exactly how the vegetation has evolved.

The economic impacts are real: cattle ranching, responsible for 80% of Brazil's current deforestation according to Figure 10, brings in valuable export income from beef, while mining bauxite, iron ore and gold generates further revenue and employment in forested areas. But the environmental cost is severe and, unlike the short-term economic gain, largely irreversible: deforestation released 105 gigatonnes of CO2 between 2001 and 2019 alone, and clearing habitat for over 50% of the world's plant and animal species risks permanent extinctions that cannot later be undone.

Removing forest cover also increases flooding and soil erosion risk, as Figure 10 states, which brings further long-term economic costs to local communities through damaged farmland and property, on top of the immediate loss of habitat. I agree that deforestation has major economic and environmental impacts, but I judge the environmental impacts are ultimately the more serious of the two, since lost biodiversity and the CO2 already released cannot be reversed the way short-term economic losses eventually can be recovered from.

In a freshwater pond ecosystem, pondweed is a producer, since it makes its own food through photosynthesis, and a tadpole is a consumer, since it feeds on the pondweed and other organic matter in the same pond.

Producers convert sunlight, water and carbon dioxide into food through photosynthesis, making their own energy rather than consuming another organism, which places them at the base of the food chain so that every other organism ultimately depends on the energy they capture.

The large water plant sits at the base of the food web in Figure 7, with arrows leading away from it towards several consumers, showing it makes its own food through photosynthesis rather than feeding on any other organism in the diagram.

In a freshwater pond ecosystem, producers such as pond weed and duckweed make their own food using sunlight through photosynthesis, and this becomes the basic source of energy that consumers such as snails and flatworms feed on directly by eating the plant material, passing that energy along to whatever feeds on them in turn.

Longshore drift transports sand and shingle along the coast in the direction the prevailing wind blows the waves. Where the coastline suddenly changes direction, such as at a river mouth or estuary, the material carried by longshore drift continues travelling in roughly the same direction rather than following the coast, so it begins to build up in the sheltered water on the lee side of the bend.

As more material is added, the deposit grows out into the sea to form a long ridge of sand or shingle joined to the land at one end. Strong winds and waves can then curve the exposed end of the spit back towards the shore, forming a recurved end, while finer sediment is carried further into the deeper water of the estuary and deposited there as the water loses its capacity to transport it any further.

Waves cause the most erosion at the base of a cliff, between the high and low water marks, through hydraulic action (the sheer power of waves smashing into the rock, forcing trapped air into cracks until they widen) and abrasion (fragments of rock hurled by the sea wearing away the cliff face). Over time this erosion cuts a wave-cut notch into the base of the cliff.

As the notch grows deeper, the rock above it becomes unsupported and eventually collapses, and the backwash then washes the collapsed material away, exposing a new section of cliff face for a fresh notch to form. This process repeats over and over, causing the whole cliff to retreat further inland, and the smoothed, gently sloping rock surface left behind at the base, where the cliff used to stand, is the wave-cut platform.

Longshore drift carries sand and shingle along the coast, with the swash moving material up the beach at the angle of the prevailing wind and the backwash pulling it straight back down the beach, so over time material zigzags along the shore. Where the coastline changes direction sharply, such as at a river mouth, this drifting material continues past the bend and is deposited in the sheltered water beyond it, gradually building into a spit.

If longshore drift causes a spit to keep growing until it stretches all the way across a bay, it traps a body of water, usually freshwater, behind it, and this complete barrier is called a bar rather than a spit. This shows a bar is really just a spit that has grown far enough to fully close off the bay it started forming across, so the same deposition process produces both landforms, only the amount of material deposited and the shape of the coastline decide which one results.

Levées form in the lower course of a river, where an increase in the volume of water flowing downstream causes the river to flood over its banks. As floodwater spreads out across the floodplain, friction with the land surface suddenly slows the water down, and this loss of energy forces the river to deposit the sediment it was carrying.

The largest, heaviest material such as sand and gravel is dropped first, right at the edge of the channel, while finer silt and mud is carried further out across the floodplain before settling. After many repeated flood events, this coarser material builds up along the riverbank, gradually raising its height until the banks stand higher than the rest of the floodplain, forming levées that can eventually burst during a severe flood.

A meander is a winding bend in a river, where lateral erosion undercuts the outer bank, since the water flows fastest there with the least friction, while material is deposited on the inner bank where the flow is slower. Over time this erosion and deposition makes the meander loop tighter, and the narrow neck of land between two closely curving bends gradually erodes further until it becomes very thin.

During a flood, when the river carries much more water, it breaks straight through this narrow neck, cutting a new, shorter and steeper channel and bypassing the old meander loop entirely. Deposition then builds up at the edges of this new straight section, sealing off the old loop from the main channel, so it becomes a separate, curved ox-bow lake which will gradually silt up into marshland over time.

In a meander bend, water flows fastest on the outer side of the curve, where the channel is deepest and there is least friction with the bed and banks. This fast-flowing water erodes the outer bank laterally, undercutting it to form a steep river cliff, so the outer bank retreats further into the surrounding land over time.

On the inner side of the same bend, the water flows more slowly and there is more friction with the shallower bed, so the river loses the energy to carry its sediment load and deposits it there instead, building up a gently sloping slip-off slope. Because erosion on the outer bank and deposition on the inner bank happen at the same time in the same bend, the meander becomes progressively more curved and can gradually migrate across the floodplain over many years.

A hanging valley starts as a smaller tributary glacier joining a larger main glacier that occupies the main valley. Both glaciers erode their valleys through abrasion, where rock fragments frozen into the ice scrape the bedrock like sandpaper, and plucking, where the ice freezes onto the rock and tears pieces away as it moves.

Because the main glacier is much larger and therefore has far more erosive power than the smaller tributary glacier, it erodes its valley floor much deeper. When the ice eventually melts, the smaller tributary valley is left 'hanging' high above the floor of the much deeper main valley, and a river flowing through the hanging valley often plunges down to the main valley floor as a waterfall.

A glacial trough begins as a former V-shaped river valley that ice comes to occupy, fed by several tributary glaciers starting in corries higher up the mountain. As these tributary glaciers join the main valley glacier, the ice erodes powerfully through abrasion, where moraine trapped in the ice sandpapers both the sides and base of the valley, and plucking, where the ice freezes onto jointed rock and tears pieces away as it flows downhill.

Because a glacier is a much wider, thicker mass of ice than a river, it widens and deepens the valley far beyond what the original river could achieve, straightening the valley's course by eroding away the interlocking spurs that a river valley would normally have. This leaves behind a valley with a broad, flat floor and very steep sides, the classic U-shaped cross-profile of a glacial trough, and after the ice melts, glacial debris and meltwater may leave ribbon lakes in hollows along the valley floor.

A corrie begins as snow collects in a hollow on a mountainside, typically facing north or north-east in the UK so it is less exposed to direct sunshine and the snow does not melt away each summer. Over time the snow compresses into glacier ice, and as gravity encourages this small corrie glacier to move downhill by rotational sliding, freeze-thaw weathering combined with plucking loosens and removes material from the back wall, making it steeper.

The plucked debris dragged along the base of the glacier then causes further erosion through abrasion, deepening the hollow into a rock basin, while erosion at the front edge of the corrie is weaker, so a rock lip or sill builds up there, sometimes raised further by deposited moraine. When the ice eventually melts, this rock lip acts as a natural dam, trapping meltwater behind it to form a round corrie lake, or tarn.

Beach nourishment, shown in Figure 10, replaces beach material removed by erosion or longshore drift, and its main benefit is that a wider beach acts as a natural buffer against both erosion and coastal flooding while also creating a more attractive amenity for tourism at a relatively low cost. The main cost, though, is that it requires constant maintenance since the added material simply washes away again, especially after winter storms, at a cost that can reach up to £500,000 per 100 metres.

Dune regeneration, shown in Figure 11, similarly benefits the coastline by absorbing wave energy naturally and increasing biodiversity by creating habitats for plants, animals and birds, at a lower typical cost of £400 to £2000 per 100 metres. However, newly planted dunes can be easily damaged by storms and take time to establish, sometimes deterring tourists from the area while the grass is being planted and protected. Overall, soft engineering works with natural coastal processes rather than against them and can improve the environment, but its lower cost comes with the trade-off of needing far more frequent upkeep than a hard engineering structure.

Figure 13's two groynes are designed to trap sand moving along the beach by longshore drift, building up a wider beach on the updrift side that acts as a buffer against wave attack and protects the cliffs behind it, while also creating a beach that is popular with tourists. However, the diagram itself shows the strategy is only partly effective, since immediately downdrift of the south groyne the cliffs are shown collapsing, because that stretch of coast has been starved of the beach material the groyne is now trapping elsewhere.

The rock armour and regraded cliff shown in the same diagram add further protection, since rock armour disperses wave energy at the base of the cliff while regrading reduces the cliff's slope angle to increase its stability, yet the diagram also shows recent slumping still occurring even with these defences in place. This shows that combining several hard engineering strategies together increases protection but does not eliminate the risk of further movement, so overall these strategies are moderately effective at protecting the cliffs directly in front of them, while genuinely increasing erosion risk further along the coast.

Sea walls, of the kind shown protecting Withernsea in Figure 13, benefit the coast by deflecting wave energy straight back out to sea and acting as a barrier against flooding, giving residents a strong sense of security, and their promenade often doubles as a public walkway. The cost, though, is that sea walls are very expensive to build and maintain, over £5000 per metre, and reflected waves can scour away the beach in front of them, eventually undermining the wall's own foundations.

Rock armour, also visible in this kind of coastal defence, benefits the coast by dispersing wave energy cheaply and is quick to build and easy to maintain compared with a sea wall, but its cost is that it makes the beach difficult and unattractive to access, since people have to climb over the large rocks, and importing the rock itself can be expensive. Overall, hard engineering structures like these are highly effective at protecting the specific stretch of coastline they defend, but at a high financial cost, and they can also make other stretches of coast worse off by disrupting the natural movement of sediment.

Figure 19 shows a physical factor that greatly raised flood risk: 340 mm of rain falling in just 24 hours would rapidly saturate the soil, exceeding its infiltration capacity so that huge amounts of water flowed overland as surface runoff rather than soaking in. Cockermouth's location at the confluence of two rivers compounds this, since it means two separate drainage basins' worth of floodwater converge in the same place at once, while the steep surrounding hills further speed up how quickly that runoff reaches the town.

The human factor shown in Figure 19 is that many homes and businesses are built directly on the floodplain, where impermeable surfaces such as concrete cannot let water percolate into the ground, shortening the lag time between rainfall and the river's peak discharge and putting more property directly in the path of rising water. Because both the physical setting (confluence, steep hills, extreme rainfall) and the human decision to build on the floodplain acted together, Cockermouth's flood risk was a genuine combination of factors rather than any single cause alone.

Planting trees in the upland catchment, shown in Figure 14, benefits the environment by increasing interception of rainfall, absorbing CO2 and creating habitats that increase biodiversity, while the Environment Agency estimates this can reduce flooding by as much as 20%, directly benefiting the people living downstream. However, this can mean a loss of potential farmland, which affects the people who previously earned a living from that upland area.

The River Quaggy restoration in Greenwich, a real example I have studied, shows this in practice: a river that had been diverted underground was brought back to the surface and restored close to its natural meandering course in 2007, with wildflower meadows and tree avenues planted along it. This brought real environmental benefits and gave local people new green recreational space, although residents also had to accept that some flooding in the restored area may occasionally occur, showing that even a strategy designed to benefit both people and the environment involves a genuine trade-off for the people living nearest to it.

The local resident's view in Figure 16 has real merit: hard engineering such as dams and floodwalls physically holds back and controls floodwater very effectively, offering the strongest, most reliable protection for expensive property on a floodplain, even though individual projects can cost several million pounds. Reservoirs specifically also generate hydroelectric power and provide a drinking water supply alongside their flood protection benefit, adding real economic value beyond just flood control.

The Environment Officer's view also carries real weight, since soft engineering strategies like tree planting genuinely reduce flooding while costing far less to implement and maintain, and, unlike hard engineering, they work with natural river processes rather than disrupting the wider ecosystem. Weighing both views, I judge hard engineering offers the strongest guaranteed protection where property value is very high, but soft engineering delivers most of the same flood-risk reduction far more cheaply and sustainably in less densely built-up catchments, so the right choice genuinely depends on what is being protected.