Wanderlust World Wanderlust World Deserts are the least populated major biome on Earth. Not "most likely to have large populations"—**least likely**. The numbers are stark:
| Biome | Density (persons/km²) | % Global Population | % Land Area |
|---|---|---|---|
| Temperate broadleaf forest | 150+ | ~25% | ~8% |
| Tropical/subtropical forest | 80–120 | ~15% | ~12% |
| Grassland/Savanna | 20–50 | ~10% | ~20% |
| Mediterranean | 100+ | ~5% | ~2% |
| Boreal forest/Taiga | 1–5 | ~1% | ~15% |
| Desert | 0.5–2 | ~1% | ~33% |
| Tundra/Ice | <0.1 | <0.1% | ~15% |
| Constraint | Impact |
|---|---|
| Water scarcity | <250 mm/yr rain; no perennial rivers (exogenous only: Nile, Colorado, Indus); groundwater deep/saline/non-renewable. |
| Temperature extremes | Diurnal swing 30–40°C; summer >50°C; winter <0°C (cold deserts). High metabolic cost. |
| Low primary productivity | <50 g C/m²/yr (vs 2000+ in tropics) → minimal forage, crops, fuel. |
| Nutrient-poor soils | Entisols/Aridisols — low organic matter, high salinity/alkalinity, caliche. |
| Sand/dust storms | Damage infrastructure, lungs, crops, solar panels. |
| Isolation | Far from markets, ports, services; transport costs extreme. |
**All depend on massive energy/subidy imports.** Not self-sustaining.
Desert cities **grow fastest** (Phoenix, Las Vegas, Dubai, Riyadh, Lima). Climate change **reduces exogenous water** (shrinking glaciers, earlier melt, less rain). **Desalination + reuse + conservation** are the only path—but energy/cost/brine limits loom.
Deserts **concentrate life at water points**—oases, rivers, coasts. The vast interior remains **empty by necessity**. They are **not population magnets—they are population filters.**