Enhanced Rock Weathering in Soil
Accelerating a natural process to remove carbon and reverse climate change
What Is Enhanced Rock Weathering?
Natural rock weathering is a geological process that removes around 1.1 Gt of CO₂ from the atmosphere per year. As silicate rocks weather, they capture carbon from the atmosphere permanently, but it happens at extremely slow rates over tens of thousands of years. Enhanced rock weathering (ERW) is a process that fast-tracks the natural process of carbon removal.
The world’s first carbon crediting methodology for Enhanced Rock Weathering
Standing true to our reputation as the world’s leading carbon removal platform for engineered carbon removal, Puro.earth has developed the first enhanced rock weathering (ERW) carbon crediting methodology. Under the Puro Standard, we issue CO₂ Removal Certificates (CORCs) to carbon removal suppliers through the Puro Registry. Climate-conscious companies can purchase CORCs to neutralize their residual emissions and support their sustainability claims.
How Enhanced Rock Weathering Captures Carbon
The natural rock weathering carbon capture process begins when carbon in the atmosphere is dissolved in rainwater and forms carbonic acid. A chemical reaction occurs when acidic rainwater comes into contact with rocks that contain silicate minerals and carbon is captured and converted into bicarbonate and/or carbonate ions. Over time, the rock break down into small particles and the bicarbonate and/or carbonate ions form part of the soil or are transported by rivers into the oceans, where the carbon is stored for tens of thousands of years.
How Enhanced Rock Weathering Accelerates CO2 Removal
Rock weathering is a natural process that removes carbon from the atmosphere. Enhanced Rock Weathering fast-tracks the carbon removal process that from thousands of years to years-decades by crushing large silicate rocks into fine particles or gathering residual rocks from other processes, such as quarry operations, and applying rocks to soil. ERW can accelerate carbon removal by:
1. Selecting the most reactive rock types,
2. Increasing the surface area of the rock, and
3. Applying rocks to optimal soils and climatic conditions.
The Puro.earth enhanced rock weathering methodology sets the requirements for verification and quantification of carbon removal and ensures high carbon credit integrity, minimal environmental impact that follows thresholds and the stipulated requirements of local or EU regulation, and scientific rigor under the Puro Standard. It is based on the best available science and quantification methods and will be revised as this understanding evolves and large data sets are developed.
Benefits of Enhanced Rock Weathering
Beyond carbon sequestration and the positive impact on the climate, ERW has many positive benefits, particularly for agriculture and the land. The spreading of silicate rocks in soil can:
• Increase crop yield and enhance agricultural productivity
• Amend degraded soils
Build plant resistance against pests and diseases Improve crop water retention, potentially increasing crop resilience to drought
• Reduces the need for fertilizers
Discover the value of your carbon removal activities
Puro.earth is the credible choice for carbon removal suppliers looking to enter the carbon markets
Take your business to net zero emissions
Puro.earth has over 74 carbon removal projects in 17 countries across the world. Neutralize your emissions by purchasing CO2 removal Certificates (CORCS) by connecting with Puro.earth accredited suppliers.