Extreme environments' futures

**Ground that stays frozen year-round**; when it thaws it becomes unstable and damages infrastructure.

Ice **melting back**, so it survives only at higher altitude and the meltwater rivers people rely on shrink.

Productive **dryland turning to desert** as drought and erosion spread (e.g. the Sahel).

**Adaptation** copes with the effects of climate change; **mitigation** cuts the causes (emissions).

**Social, economic and environmental** — a truly sustainable strategy scores on all three.

It **cracks roads, pipelines and houses**, opens new oil/gas routes, and thinner sea ice shortens hunting (Alaska).

Shrinking meltwater cuts the **dry-season water supply** for irrigation and towns (Quechua farmers, Peru).

Abundant sunshine powers **remote villages and desalination** for fresh water, without fossil fuels (Atacama / the Gulf).

The **Great Green Wall** — drought-tolerant trees and crops plus soil/water conservation hold back the desert.

It is **expensive**, depends on outside funding/experts, and can cause new harm (desalination brine, mining).

Both sides (opportunities AND challenges), **named places**, a weighing of the three pillars, and a justified conclusion.

The most sustainable schemes combine new tech with local traditional methods (Andean canals, Sahel agroforestry).