Abstract:
:To avoid dangerous climate change, new technologies must remove billions of tonnes of CO2 from the atmosphere every year by mid-century. Here we detail a land-based enhanced weathering cycle utilizing magnesite (MgCO3) feedstock to repeatedly capture CO2 from the atmosphere. In this process, MgCO3 is calcined, producing caustic magnesia (MgO) and high-purity CO2. This MgO is spread over land to carbonate for a year by reacting with atmospheric CO2. The carbonate minerals are then recollected and re-calcined. The reproduced MgO is spread over land to carbonate again. We show this process could cost approximately $46-159 tCO2-1 net removed from the atmosphere, considering grid and solar electricity without post-processing costs. This technology may achieve lower costs than projections for more extensively engineered Direct Air Capture methods. It has the scalable potential to remove at least 2-3 GtCO2 year-1, and may make a meaningful contribution to mitigating climate change.
journal_name
Nat Communjournal_title
Nature communicationsauthors
McQueen N,Kelemen P,Dipple G,Renforth P,Wilcox Jdoi
10.1038/s41467-020-16510-3subject
Has Abstractpub_date
2020-07-03 00:00:00pages
3299issue
1issn
2041-1723pii
10.1038/s41467-020-16510-3journal_volume
11pub_type
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