抄録
<jats:title>Abstract</jats:title><jats:p>To avoid dangerous climate change, new technologies must remove billions of tonnes of CO<jats:sub>2</jats:sub> from the atmosphere every year by mid-century. Here we detail a land-based enhanced weathering cycle utilizing magnesite (MgCO<jats:sub>3</jats:sub>) feedstock to repeatedly capture CO<jats:sub>2</jats:sub> from the atmosphere. In this process, MgCO<jats:sub>3</jats:sub> is calcined, producing caustic magnesia (MgO) and high-purity CO<jats:sub>2</jats:sub>. This MgO is spread over land to carbonate for a year by reacting with atmospheric CO<jats:sub>2</jats:sub>. 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 tCO<jats:sub>2</jats:sub><jats:sup>−1</jats:sup> 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 GtCO<jats:sub>2</jats:sub> year<jats:sup>−1</jats:sup>, and may make a meaningful contribution to mitigating climate change.</jats:p>
収録刊行物
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- Nature Communications
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Nature Communications 11 (1), 3299-, 2020-07-03
Springer Science and Business Media LLC