Topic 7: Natural resources

Natural resources are raw materials and energy sources used and consumed by society, including sunlight, air, water, land, rocks, ecosystems and living things.

Classify each by what society uses, whether it is a material stock or recurring energy flow, its regeneration rate and who can access it.

Sunlight is an incoming energy flow; fish are a biological stock whose harvest is renewable only when recruitment keeps pace.

Useful to society does not mean unlimited, freely accessible or sustainably used.

Resource does not mean unlimited or privately owned.

Natural capital is the stock of natural resources available on Earth that can support future goods and services.

A local inventory can distinguish living renewable capital such as woodland, recurring or replenishable capital such as a river or aquifer, and non-renewable geological capital such as rock or mineral deposits.

Removing mature forest faster than regrowth raises present timber income while shrinking the stock and its future service capacity.

Identify the stock, its location and renewal timescale before claiming that local natural capital is secure.

Natural capital is not the same as annual income.

Natural income is the flow of goods and services produced by natural capital without depleting the supporting stock.

A forest can yield timber and also regulate water and climate; harvesting that damages the stock can reduce both market goods and non-market services.

Measure the flow per unit time and verify that the natural-capital stock and process remain functional.

A large stock does not justify any extraction rate, and services are income even when they have no market price.

Calling nature 'natural capital', 'income' and 'services' is a model that foregrounds benefits and sustainable rates but frames nature in human-use terms.

The model can reveal stock depletion and make long-term resource limits visible. Its risk is an extreme anthropocentric reading in which nature appears valuable only for exploitation.

A forest described only as timber capital may hide intrinsic, cultural and spiritual value; adding those perspectives improves the decision without discarding stock–flow analysis.

Use the model for a defined sustainability question, then state which non-market relationships and values it leaves out.

A useful model is not a complete copy of the system.

An ecosystem service is a life-supporting benefit generated by ecological structure and process.

Damaging the habitat can weaken several services together because they share soil, vegetation, water and biological processes.

Trace ecosystem structure → process → service → beneficiary, then identify the pressure that could interrupt the chain.

Listing a benefit without its ecological mechanism cannot explain vulnerability or management.

Renewable means the resource replenishes at least as fast as the rate of use under stated conditions.

Compare extraction with recruitment, recharge or regrowth and include time scale and access.

A groundwater pump withdrawing 12 units while recharge is 8 creates a deficit despite rainfall.

When is a harvest renewable? when removal does not exceed recovery over the relevant period.

Renewable is conditional, not a permanent label.

Natural capital can hold several kinds of value at once, and different stakeholders may weight them differently.

A mangrove can be nursery habitat, storm protection, livelihood, cultural place and development land; a price captures only part of that value.

State value type, stakeholder, evidence and time horizon before comparing alternatives.

Different valuations do not imply that evidence is irrelevant; they show that several legitimate criteria may be in conflict.

Natural-capital value changes with scarcity, demand, technology, ethics, policy, knowledge and available substitutes.

A higher market value can coexist with greater environmental or social cost: lithium demand may rise while extraction adds water pressure and pollution risk.

Always state whose value changed, when, why and which alternative or new risk altered the comparison.

Changing price is only one signal; cultural, intrinsic, environmental and technological values can move differently.

Sustainable natural-capital use must satisfy two rate limits: extraction must not exceed regeneration, and waste release must not exceed environmental transformation or safe assimilation.

A fishery can remain within recruitment yet still be unsustainable if processing waste accumulates faster than the receiving water can transform it.

Measure both resource stock and waste sink; variability and delayed effects can make a safe-looking average misleading.

Keeping harvest below average regrowth does not excuse pollution or ecosystem damage elsewhere in the chain.

Resource security is long-term access to sufficient, affordable and usable resources—not merely their physical presence.

Compare availability, affordability, quality, rights, import dependence and resilience to shocks; neither community is fully self-sufficient.

A contrast must use the same resource and criteria while acknowledging environmental setting and external supply.

Local sustainability projects do not prove complete food or water security when critical supplies are imported.

A society's resource choice reflects economic, sociocultural, political, environmental, geographical, technological and historical factors, plus changing priorities such as net zero.

Named resource—lithium in Chile's Salar de Atacama: battery demand raises economic and strategic value, while desert water scarcity, extraction impacts, private-versus-national control, processing capacity and local politics shape the choice.

Net-zero agreements increase demand for electric transport and renewable-energy storage, shifting priority from coal toward lithium; this does not make lithium extraction impact-free.

Compare benefits, affected groups, geography, technology, governance and lifecycle damage before selecting extraction scale or ownership model.

A resource used in low-carbon technology is not automatically sustainable at the mine or community scale.

Renewable energy sources are replenished or recur on a useful human timescale; non-renewable sources depend on finite stocks.

Most energy released from these sources is converted to electricity. Judge the source separately from the turbines, dams, panels, reactors, power lines and other infrastructure used to capture and deliver it.

Sunlight recurs, but a solar farm still uses land and manufactured panels; nuclear generation is low-carbon in operation but uranium or plutonium fuel is non-renewable.

Renewable does not mean impact-free, and low-carbon does not mean renewable.

Global energy consumption rises when population grows and when average energy use per person increases.

Fossil fuels still provide most global energy, while renewable supply is growing. Steel, concrete and synthetic-fertilizer production remain strongly dependent on fossil fuels, so changing supply and reducing consumption must occur together.

A country can add renewable generation while total demand grows so quickly that absolute fossil-fuel use does not fall; compare total energy, source shares and absolute amounts over the same period.

A rising renewable percentage shows a changing mix, not by itself a decline in fossil-fuel consumption.

Share, absolute amount and per-capita use answer different questions.

Energy-source sustainability must be judged across extraction, processing, construction, operation, restoration and end-of-life—not only while electricity is generated.

Wind avoids fuel combustion during operation but still requires steel, concrete, transport and end-of-life management; environmental restoration may be required for both renewable and non-renewable systems.

Compare the same lifecycle stages, timescale and criteria before ranking sources.

Low operational emissions are not zero lifecycle impact, and one impact cannot stand in for total sustainability.

A country's energy mix reflects its resource geography, infrastructure, policy and demand, so the same source can have different advantages in different places.

China's choices balance industrial demand, existing coal assets, pollution and rapid renewable expansion. Iceland's geology and water resources support a contrasting hydro-geothermal mix.

Compare both countries against the same criteria and timescale; a benefit under one criterion can create a cost under another.

There is no context-free 'best' energy source, and a national average can hide transport or local environmental impacts.

Storage shifts surplus energy to a later shortfall; it does not create energy.

Intermittent output must be charged when supply exceeds demand and discharged when demand exceeds output, with losses.

A battery charges from midday solar and discharges during the evening peak.

What job does storage perform? timing and balancing, not generation.

Storage is not a new energy source.

Conservation reduces the service used; efficiency delivers the same service with less energy.

Both can lower demand, but rebound behaviour can consume part of an efficiency gain.

Turning off an unused lamp is conservation; an LED giving the same light with less electricity is efficiency.

Which is efficiency? same light, lower electricity per light-hour.

Efficiency is not identical to using less service.

Waste can be classified on two independent axes: where it comes from (source) and what kind of material or hazard it is (type).

A discarded computer from a household is domestic by source and e-waste by type; the two labels answer different questions.

Source does not determine type: domestic waste can include food, e-waste or biohazardous material.

Solid domestic waste is a mixed stream whose composition determines separation, recovery and disposal options.

It can include paper, cardboard, glass, metals, plastics, organic kitchen or garden material, packaging, construction debris and clothing; each fraction has different contamination and recovery pathways.

Food residue can contaminate otherwise recyclable paper, while a battery can introduce hazardous metals into a larger household stream, so separation at source matters.

A composition audit measures each fraction before selecting facilities or targets.

Household waste is not one uniform material, and the largest fraction is not always the most hazardous.

Waste volume and composition change over time and between societies as consumption and management systems change.

A bag ban may reduce plastic film but increase paper or reusable-bag flows, so compare mass, composition and downstream fate before and after the change.

Less waste in one bin does not prove less total material use or environmental impact.

Waste impacts can occur far from where products were consumed because collection, export, recycling and disposal move materials and hazards between places.

When high-income societies export difficult or hazardous waste to lower-income societies with weaker protection or treatment capacity, local communities may bear pollution and health risks without receiving the original benefits—an environmental injustice.

Exported e-waste may be dismantled for valuable metals while workers and nearby soil or water receive toxic residues.

Trace origin, route, treatment, residues, beneficiaries and exposed groups; relocation is not impact removal.

A legal export or recycling label does not by itself prove safe treatment or fair distribution.

An ecosystem can transform or store some waste, but pollution occurs when harmful inputs arrive faster than they can be transformed into harmless substances.

Biodegradable materials can be broken down biologically, but the rate depends on conditions such as oxygen, temperature and decomposer activity. Persistent pollutants may remain for long periods.

Half-life is the time required for half of a substance to decay or transform. Repeated inputs can still accumulate when each new input arrives before earlier material has sufficiently declined.

Compare input rate with transformation and removal rate, then consider toxicity, persistence and receiving-system capacity.

Biodegradable does not mean harmless at any quantity or in every environment.

Preventative waste strategies avoid material use or control pollutant release before damage occurs; restorative strategies clean up and repair systems afterwards.

Repairing a phone preserves more embedded material and function than shredding it for metals; cleaning leaked toxins later may be costly and incomplete.

Recycling and cleanup can be useful, but they do not make continued high consumption the most sustainable option.

No disposal option is best for every waste stream; compare material suitability, emissions, land, energy, cost, residues and social effects.

Food scraps may suit composting, clean metals recycling and hazardous residues controlled treatment; separation determines whether those routes remain safe.

Reducing volume or labelling a route 'recycling' does not eliminate residues or upstream impacts.

Sustainable SDW management improves when policy, incentives, information and infrastructure make the safer action feasible and worthwhile.

Separate bins without reliable collection or clear labels can increase contamination; combine access, instructions and feedback, then measure participation and recovery quality.

Awareness alone does not overcome price, access or enforcement barriers.

A circular economy designs products and systems to retain function and material value through maintenance, reuse, repair, remanufacture and recycling, reducing new extraction and residual waste.

Example—smartphone path: minerals and components are manufactured into a phone; durable design and software support extend use; the phone is repaired or passed to a second user; usable components are recovered; separated metals return to manufacturing; only unrecoverable residue is safely disposed.

Trace design → manufacture → use → collection → highest-value recovery → recovered input, including energy, contamination and losses at each stage.

A loop is never perfectly closed: quality loss, energy use, missing collection and rebound demand can still create impacts.