Nano- to Global-Scale Uncertainties in Terrestrial Enhanced Weathering.

Area of Science:

• Environmental Science
• Climate Science
• Geochemistry

Background:

• Enhanced weathering (EW) is a promising negative emissions technology to limit global warming.
• EW utilizes accelerated silicate rock dissolution in soils for carbon sequestration.
• Accurate carbon sequestration estimates require further research across various conditions.

Purpose of the Study:

• Identify optimal environmental conditions for EW.
• Improve field dissolution rate and CO2 removal efficacy estimates.
• Explore alternative silicate material sources for EW.

Main Methods:

• Literature review and synthesis of current EW research.
• Analysis of factors influencing silicate weathering in soils.
• Discussion of integrated modeling-experimental approaches.

Main Results:

• Significant knowledge gaps exist in quantifying EW's carbon sequestration potential.
• Environmental conditions, silicate material type, soil, and plant interactions critically affect EW efficacy.
• Alternative silicate sources are needed to meet potential EW demands.

Conclusions:

• Extensive research is required to refine EW's application and scalability.
• Integrated modeling and experimental studies are crucial for accurate field measurements.
• Coordinating EW with land management practices is essential for successful climate change mitigation.