Project
Impact report
Back
UNDO Enhanced Rock Weathering

Scotland

UNDO Enhanced Rock Weathering

UNDO Enhanced Rock Weathering | Scotland
UNDO Enhanced Rock Weathering | Scotland
UNDO Enhanced Rock Weathering | Scotland
UNDO Enhanced Rock Weathering | Scotland

6

Number of Goals this project addresses

Sign up to view price

Price per kg of CO₂ mitigation

The project accelerates the natural process of rock weathering by spreading crushed silicate rock on agricultural land, increasing the surface area of the rock and therefore increasing its contact with CO2. Overall, the reduction of the timescale from millions of years to mere decades. Once the reaction takes place, the CO2 is permanently locked away for 100,000+ years.

Project highlights

  • permanently lock CO2 away without the risk of reversal from farming activities
  • increase in soil quality as rock nutrients wash into soil which benefits the farmer
  • rigorous testing of the rock quality

About

Enhanced rock weathering (ERW) accelerates the natural process of weathering, wherein CO₂ in rainwater and soil moisture reacts with basalt surface area, resulting in long-term storage as solid bicarbonate ions for over 100,000 years.

UNDO's operational strategy focuses on efficiently sourcing, transporting, and distributing basalt. This involves procuring crushed basalt rock, sourced as a by-product of mining and quarrying, thereby avoiding additional emissions. Furthermore, UNDO rigorously tests all new basalt sources to ensure trace metal levels are well below any agricultural thresholds.

A strong network to farmers distribute the basalt on their land. This enhances the soil quality and in turn makes for a better yield.

Although other silicates may have potentially faster weathering rates, UNDO favours basalt for ERW due to its projected 20-year weathering timeline and significant soil health benefits. Basalt's widespread availability worldwide positions it as the optimal choice for scaling ERW to meet UNDO's billion-tonne targets by 2050.

Offset registry

Puro Earth

Sign up. Be inspired. Get clicking.

Subscribe now to stay up to date with CarbonClick, carbon offsetting and climate action.

NZBN: 9429047450356
© 2025 CarbonClick Limited