Research project

Greenhouse Gas Removal via Enhanced Rock Weathering (GGREW)

Project overview

To limit the increase in global temperature to less than 2 °C, “negative emissions”, or the active removal of carbon dioxide from the atmosphere, are required. Weathering, the chemical breakdown (dissolution) of rocks at the Earth’s surface, is a natural process that converts atmospheric carbon dioxide into carbonate minerals or hydrogen carbonate and carbonate ions (“alkalinity”). If the weathering process can be speeded up, or enhanced, then levels of atmospheric carbon dioxide would fall.

Mining of precious commodities, such as diamonds and gold, provides a continuous supply of freshly ground up rock material which, under the right conditions, could be easily weathered, removing atmospheric CO2 in the process.

Our project aims to provide critical knowledge to answer the following questions:
• Are rocks left over from extracting precious metals suitable for capturing carbon dioxide on human timescales?
• Are there low-cost engineering solutions that can be used to accelerate the weathering process?
• How much carbon dioxide could potentially be captured?

We are addressing these questions through identification of the most easily weatherable mine waste materials, the testing of physical, chemical and biological methods for speeding up weathering kinetics, and an investigation into the availability of (suitable) rock materials at mine sites on a national and global scale.

Staff

Lead researchers

Professor Rachael James

Professor of Geochemistry
Research interests
  • Enhanced rock weathering and other techniques for removing carbon dioxide from the atmosphe…
  • Novel isotopic signatures of biogeochemical cycling, including iron, chromium, lithium and …
  • Exploration for new sources of metals and elements critical for emerging green technologies…
Connect with Rachael

Other researchers

Professor Damon Teagle

Professor of Geochemistry
Research interests
  • formation and evolution of the ocean crust
  • fluid-rock interactions and Ore mineralisation
  • geochemical analysis
Connect with Damon

Professor Juerg Matter

Professor of Geoengineering&Carbon Manag
Connect with Juerg

Professor Phyllis Lam

Professor
Research interests
  • Prof. Lam's research interest lies in the functional roles of microorganisms in biogeochemica…
  • Current research topics include:
  • Shortcuts in the nitrogen cycle – novel pathways and microbial players for nitrogen remineral…
Connect with Phyllis

Collaborating research institutes, centres and groups

Research outputs

Liam A Bullock, Rachael James, Juerg Matter, Phil Renforth & Damon Teagle, 2021, Frontiers in Climate, 3
Type: article
Chiara Marieni, Juerg M. Matter & Damon A.H. Teagle, 2020, Geochimica et Cosmochimica Acta, 272, 259-275
Type: article
David Edwards, Felix Lim, Rachael James, Christopher Pearce, Julie Scholes, Robert Freckleton & David Beerling, 2017, Biology Letters, 13(4)
Type: article