Climate change reshapes soils by changing heat and water conditions that control weathering, organic matter, and vegetation cover. These shifts can weaken soil structure and accelerate erosion, affecting ecosystems, agriculture, and water quality.

Core idea: climate affects soil formation and stability

Soils develop under long-term patterns of temperature and precipitation.

Diagram of a soil profile showing the major horizons (O, A, B, and C) and their depth ranges. It helps connect climate-driven changes in organic inputs and decomposition to where soil organic matter accumulates (surface horizons) and why the topsoil layer is especially vulnerable to erosion. Source

When climate changes, the balance between soil building (organic inputs, aggregation) and soil loss (decomposition, erosion) can shift toward degradation.

Key terms

Erosion matters because the most fertile material is usually the topsoil, which is also the easiest to remove.

Climate drivers that alter soil conditions

Warming and heat extremes

Rising temperature can change soil by:

• Increasing evapotranspiration, drying soils and reducing plant cover that protects the surface

• Speeding microbial decomposition of soil organic matter (SOM), which reduces aggregation and water-holding capacity

• Intensifying freeze–thaw changes in some regions; in others, reducing freezing seasons that once stabilised soil and limited winter runoff

Shifts in precipitation patterns

Climate change can modify rainfall and snow patterns in ways that stress soils:

• More intense downpours increase runoff energy, splash erosion, and gully formation

• Longer droughts reduce plant growth and ground cover, leaving bare soil exposed

• Changes from snow to rain can increase winter runoff and erosion when soils are saturated

• Earlier snowmelt can shift peak flows, altering seasonal erosion timing

How reduced soil viability develops (why soils become easier to erode)

“Soil viability” in this context refers to how well soil supports plant growth and ecosystem function. Climate-driven reductions in viability often involve:

• Loss of soil organic matter: fewer plant inputs during drought plus faster decay under warmth

• Weaker soil structure: fewer stable aggregates means more crusting and lower infiltration

• Lower infiltration and water storage: rainfall runs off instead of soaking in, increasing erosion risk

• Vegetation change: heat and water stress can shift plant communities, reducing root density that binds soil

• Nutrient losses: heavy rains can increase leaching and runoff of nitrogen and phosphorus attached to soil particles

Mechanisms: how climate change increases erosion

Water erosion under heavier rainfall

When storms intensify, erosion increases through linked steps:

• Raindrop impact detaches particles (splash erosion)

• Runoff carries particles downslope (sheet erosion)

• Concentrated flow cuts channels (rill and gully erosion)

• Sediment is deposited in streams, reservoirs, and coastal areas

Soils with reduced aggregation and low plant cover are especially vulnerable because they seal over, further boosting runoff.

Wind erosion under drought and drying

Hotter, drier conditions promote wind erosion by:

Satellite imagery of a major dust event over the southwestern United States, paired with an aerosol index overlay that highlights where airborne particles are most concentrated. This provides concrete visual evidence that wind erosion can export fine, nutrient-rich soil fractions far beyond the source region, affecting air quality and deposition elsewhere. Source

• Reducing soil moisture that normally helps particles stick together

• Decreasing plant cover and surface roughness, allowing faster near-surface winds

• Increasing dust storms, which remove fine, nutrient-rich particles and can transport them long distances

Disturbance-driven erosion (fire, thaw, and slope failure)

Climate change can amplify episodic erosion events:

• Wildfire risk rises with heat and drought; burned areas lose canopy and litter, and some soils become water-repellent, increasing post-fire runoff and debris flows

• Permafrost thaw destabilises ground, increasing slumping and sediment delivery to waterways

• More frequent extreme rainfall can trigger landslides where soils on steep slopes become saturated

Consequences closely tied to soil and erosion

Erosion and declining soil condition can lead to:

• Reduced agricultural productivity from topsoil loss and poorer water retention

• Increased sedimentation that buries stream habitats and clogs reservoirs and irrigation infrastructure

• Higher transport of nutrients and contaminants attached to soil particles, degrading water quality

• More airborne particulate matter from dust, affecting visibility and regional deposition patterns

Management responses that target erosion risk under climate change

Strategies focus on keeping soil covered, increasing infiltration, and stabilising slopes:

• Maintain ground cover: cover crops, mulching, perennial vegetation

• Reduce disturbance: no-till or conservation tillage to protect aggregates

• Slow and spread water: contour farming, terraces, grassed waterways

• Protect stream edges: riparian buffers to trap sediment before it reaches channels

• Improve soil structure: organic amendments that build SOM and aggregation

• Adjust grazing and traffic to prevent compaction that increases runoff