Managing extreme environments

A **hot arid** (desert) or **cold** (polar / high-latitude / high-altitude) region — sparsely settled and hard to use.

Extreme **dryness** — low, unreliable rainfall and high evaporation.

Supplying water **artificially** to grow crops where rainfall is too low.

An **underground store of water** in permeable rock, reached by wells or boreholes.

**Salt building up** in irrigated soil as water evaporates, harming crops and degrading land.

Low rainfall forces costly **irrigation**; high evaporation causes **salinization**; soil is lost to **desertification** + wind erosion; water tables fall.

It raises **transport costs and wages** and lengthens supply lines, so extraction only pays where reserves are large and prices high.

**Desalination, deep boreholes/solar wells, water transfer schemes, dams, pipelines and ice roads.**

The **Murray-Darling Basin** (inland Australia): irrigated cotton/fruit/cereals, but over-extraction and salinization degrade the land.

**Arctic oil and gas** (Russian Arctic, Alaska's North Slope + the Trans-Alaska Pipeline) — huge reserves, but remote, costly and risky.

Access to **water, technology, capital, markets and infrastructure** differs between places, so opportunity is greater in richer, wetter, better-connected locations.

A **named case study** with data, **both** opportunities and challenges, why scope varies between places, and a **justified conclusion**.

A place with harsh, limiting conditions (very hot, cold, dry or high) and **fragile** ecosystems that recover slowly.

Any group with an interest in how a place is used — locals/indigenous people, governments, TNCs, tourists, conservationists.

When different groups want **incompatible** things from the same place (e.g. mining vs protecting wildlife).

The number of visitors a fragile place can take **before it is damaged**.

The share of tourist spending that **leaves** the local area (to foreign tour firms/TNCs) instead of benefiting locals.

When a state asserts control over valuable resources (minerals, water), often clashing with other countries or TNCs.

**Opportunity** = a benefit (income, jobs, awareness); **challenge** = a cost/pressure (damage, scarce water used, cultural change).

Their ecosystems are **fragile and slow to recover** — desert crust, tundra and glaciers take decades to heal.

Driest desert; tourism + **copper/lithium mines** compete for scarce water with indigenous Atacameno communities and wetlands.

Oil, gas and minerals + cruise/wildlife tourism; drilling disturbs caribou and tundra, splits indigenous Inupiat, and rival nations claim the seabed.

No residents, so conflict is **tourists/operators vs conservationists**; growing cruise tourism risks pristine wilderness protected by the Antarctic Treaty.

Named stakeholders + named places at **different scales**, competing viewpoints, a weighing of **relative power**, and a justified judgement.

**Land degradation in arid/semi-arid regions** until productive land becomes desert-like — driven by climate and human pressure.

No — it is **land degradation at the dryland margins** (e.g. the Sahel), caused by drought combined with human over-use.

**Drought, falling and erratic rainfall, and climate change** (higher temperatures drying the soil and killing vegetation).

**Overgrazing, over-cultivation, deforestation, poor irrigation (salinisation), population pressure and conflict.**

Too many animals strip vegetation faster than it regrows -> bare soil is compacted and eroded -> land becomes unusable.

It diverts money and labour from land care, forces over-use of fragile land, and lets soil-conservation works decay.

**Salt building up in the soil** (often from over-irrigation in dry heat), poisoning it so crops can no longer grow.

The **African Great Green Wall** (a belt of restored land across the Sahel) or **China's Loess Plateau** restoration.

It is a **global driver** — no single dryland country can control falling rainfall and rising temperatures.

The **causes** (grazing rules, tree planting, terraces, irrigation) and the **consequences** (food aid, new livelihoods, relocation).

**Named drylands/schemes**, a weighing of causes/strategies across scales, and a clear **judgement** (local manageable, global cause hard).

A physical trigger (drought) weakens the land; a human accelerator (overgrazing) tips it over — they **compound** each other.