A great deal has been written about Negative Emission Technology - an approach to mitigating CO2 levels by the removal of CO2 or methane from the atmosphere or the ocean. The importance of negative emissions is illustrated by the fact that of the over 100 climate modeling simulations consistent with the Paris Agreement goals, 87% of them involve NETs.
Natural Carbon Dioxide Removal (CDR) processes already remove in excess of 22 Gt/y of CO2 from the atmosphere, and thus significantly moderate the climate effects of our current 41 Gt/yr of emissions (Le Quéré, et al, 2018). A combination of reduced emissions and various NETs will be required to remove the excess.
Several of these have been listed elsewhere
A Direct Carbon Capture
B Perennial Crops
C Enhanced Weathering the Best NET
D Ocean Farming
E Clean Concrete
F Methane
G Afforestation and Reforestation
H BECCS
We place especial emphasis on Enchanced Weathering
For reasons stated we have not placed the last two in our high priority group.
Le Quéré, C. L. et al. (2018) Global Carbon Budget 2017. Earth Syst. Sci. Data 10:405.
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